Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands |
Total |
Cumulative Effect Period of Adoption Adjustment |
Common Stock |
Additional Paid-In Capital |
Accumulated Other Comprehensive Income (Loss) |
Accumulated Deficit |
Accumulated Deficit
Cumulative Effect Period of Adoption Adjustment
|
Balances at Dec. 31, 2018 |
$ 131,539
|
$ 10,327
|
$ 23
|
$ 281,891
|
$ (47)
|
$ (150,328)
|
$ 10,327
|
Common Stock Balance, Shares at Dec. 31, 2018 |
|
|
22,848,184
|
|
|
|
|
Accounting Standards Update [Extensible List] |
us-gaap:AccountingStandardsUpdate201409Member
|
|
|
|
|
|
|
Exercise of common stock options |
$ 42
|
|
|
42
|
|
|
|
Exercise of common stock options, Shares |
|
|
8,347
|
|
|
|
|
Issuance of common stock under Employee Stock Purchase Plan |
671
|
|
|
671
|
|
|
|
Issuance of common stock under Employee Stock Purchase Plan, Shares |
|
|
68,910
|
|
|
|
|
Stock-based compensation expense |
2,286
|
|
|
2,286
|
|
|
|
Net unrealized gain (loss) on available-for- sale securities |
103
|
|
|
|
103
|
|
|
Net income (loss) |
(14,250)
|
|
|
|
|
(14,250)
|
|
Balances at Mar. 31, 2019 |
130,718
|
|
$ 23
|
284,890
|
56
|
(154,251)
|
|
Common Stock Balance, Shares at Mar. 31, 2019 |
|
|
22,925,441
|
|
|
|
|
Balances at Dec. 31, 2018 |
131,539
|
10,327
|
$ 23
|
281,891
|
(47)
|
(150,328)
|
10,327
|
Common Stock Balance, Shares at Dec. 31, 2018 |
|
|
22,848,184
|
|
|
|
|
Net unrealized gain (loss) on available-for- sale securities |
270
|
|
|
|
|
|
|
Net income (loss) |
(40,955)
|
|
|
|
|
|
|
Balances at Sep. 30, 2019 |
109,906
|
|
$ 23
|
290,616
|
223
|
(180,956)
|
|
Common Stock Balance, Shares at Sep. 30, 2019 |
|
|
23,090,002
|
|
|
|
|
Balances at Dec. 31, 2018 |
$ 131,539
|
$ 10,327
|
$ 23
|
281,891
|
(47)
|
(150,328)
|
$ 10,327
|
Common Stock Balance, Shares at Dec. 31, 2018 |
|
|
22,848,184
|
|
|
|
|
Exercise of common stock options, Shares |
191,153
|
|
|
|
|
|
|
Balances at Dec. 31, 2019 |
$ 97,789
|
|
$ 23
|
293,346
|
165
|
(195,745)
|
|
Common Stock Balance, Shares at Dec. 31, 2019 |
|
|
23,098,969
|
|
|
|
|
Balances at Mar. 31, 2019 |
130,718
|
|
$ 23
|
284,890
|
56
|
(154,251)
|
|
Common Stock Balance, Shares at Mar. 31, 2019 |
|
|
22,925,441
|
|
|
|
|
Exercise of common stock options |
10
|
|
|
10
|
|
|
|
Exercise of common stock options, Shares |
|
|
1,762
|
|
|
|
|
Stock-based compensation expense |
2,463
|
|
|
2,463
|
|
|
|
Net unrealized gain (loss) on available-for- sale securities |
157
|
|
|
|
157
|
|
|
Net income (loss) |
(13,793)
|
|
|
|
|
(13,793)
|
|
Balances at Jun. 30, 2019 |
119,555
|
|
$ 23
|
287,363
|
213
|
(168,044)
|
|
Common Stock Balance, Shares at Jun. 30, 2019 |
|
|
22,927,203
|
|
|
|
|
Exercise of common stock options |
81
|
|
|
81
|
|
|
|
Exercise of common stock options, Shares |
|
|
16,128
|
|
|
|
|
Issuance of common stock under Employee Stock Purchase Plan |
589
|
|
|
589
|
|
|
|
Issuance of common stock under Employee Stock Purchase Plan, Shares |
|
|
63,029
|
|
|
|
|
Vesting of restricted stock units |
|
|
114,103
|
|
|
|
|
Stock transaction associated with taxes withheld on restricted stock units |
(297)
|
|
|
(297)
|
|
|
|
Stock transaction associated with taxes withheld on restricted stock units,Shares |
|
|
(30,461)
|
|
|
|
|
Stock-based compensation expense |
2,880
|
|
|
2,880
|
|
|
|
Net unrealized gain (loss) on available-for- sale securities |
10
|
|
|
|
10
|
|
|
Net income (loss) |
(12,912)
|
|
|
|
|
(12,912)
|
|
Balances at Sep. 30, 2019 |
109,906
|
|
$ 23
|
290,616
|
223
|
(180,956)
|
|
Common Stock Balance, Shares at Sep. 30, 2019 |
|
|
23,090,002
|
|
|
|
|
Balances at Dec. 31, 2019 |
97,789
|
|
$ 23
|
293,346
|
165
|
(195,745)
|
|
Common Stock Balance, Shares at Dec. 31, 2019 |
|
|
23,098,969
|
|
|
|
|
Exercise of common stock options |
56
|
|
|
56
|
|
|
|
Exercise of common stock options, Shares |
|
|
12,937
|
|
|
|
|
Issuance of common stock under Employee Stock Purchase Plan |
646
|
|
|
646
|
|
|
|
Issuance of common stock under Employee Stock Purchase Plan, Shares |
|
|
74,465
|
|
|
|
|
Vesting of restricted stock units |
|
|
41,050
|
|
|
|
|
Stock-based compensation expense |
2,707
|
|
|
2,707
|
|
|
|
Issuance of common stock warrants in connection with debt refinancing |
619
|
|
|
619
|
|
|
|
Net unrealized gain (loss) on available-for- sale securities |
(137)
|
|
|
|
(137)
|
|
|
Net income (loss) |
(19,595)
|
|
|
|
|
(19,595)
|
|
Balances at Mar. 31, 2020 |
82,085
|
|
$ 23
|
297,374
|
28
|
(215,340)
|
|
Common Stock Balance, Shares at Mar. 31, 2020 |
|
|
23,227,421
|
|
|
|
|
Balances at Dec. 31, 2019 |
$ 97,789
|
|
$ 23
|
293,346
|
165
|
(195,745)
|
|
Common Stock Balance, Shares at Dec. 31, 2019 |
|
|
23,098,969
|
|
|
|
|
Exercise of common stock options, Shares |
191,153
|
|
|
|
|
|
|
Net unrealized gain (loss) on available-for- sale securities |
$ 72
|
|
|
|
|
|
|
Net income (loss) |
27,416
|
|
|
|
|
|
|
Balances at Sep. 30, 2020 |
244,119
|
|
$ 38
|
412,173
|
237
|
(168,329)
|
|
Common Stock Balance, Shares at Sep. 30, 2020 |
|
|
38,092,978
|
|
|
|
|
Balances at Mar. 31, 2020 |
82,085
|
|
$ 23
|
297,374
|
28
|
(215,340)
|
|
Common Stock Balance, Shares at Mar. 31, 2020 |
|
|
23,227,421
|
|
|
|
|
Exercise of common stock options |
8
|
|
|
8
|
|
|
|
Exercise of common stock options, Shares |
|
|
1,257
|
|
|
|
|
Vesting of restricted stock units |
|
|
250
|
|
|
|
|
Stock-based compensation expense |
3,011
|
|
|
3,011
|
|
|
|
Issuance of common stock in connection with public offering, net of issuance costs |
91,411
|
|
$ 13
|
91,398
|
|
|
|
Issuance of common stock in connection with public offering, net of issuance costs, Shares |
|
|
12,650,000
|
|
|
|
|
Net unrealized gain (loss) on available-for- sale securities |
370
|
|
|
|
370
|
|
|
Net income (loss) |
29,872
|
|
|
|
|
29,872
|
|
Balances at Jun. 30, 2020 |
206,757
|
|
$ 36
|
391,791
|
398
|
(185,468)
|
|
Common Stock Balance, Shares at Jun. 30, 2020 |
|
|
35,878,928
|
|
|
|
|
Exercise of common stock options |
108
|
|
|
108
|
|
|
|
Exercise of common stock options, Shares |
|
|
12,308
|
|
|
|
|
Issuance of common stock under Employee Stock Purchase Plan |
639
|
|
|
639
|
|
|
|
Issuance of common stock under Employee Stock Purchase Plan, Shares |
|
|
121,527
|
|
|
|
|
Vesting of restricted stock units |
|
|
110,676
|
|
|
|
|
Stock transaction associated with taxes withheld on restricted stock units |
(314)
|
|
|
(314)
|
|
|
|
Stock transaction associated with taxes withheld on restricted stock units,Shares |
|
|
(30,461)
|
|
|
|
|
Issuance of common stock in connection with At-The-Market sale, net of issuance costs |
16,839
|
|
$ 2
|
16,837
|
|
|
|
Issuance of common stock in connection with At-The-Market sale, net of issuance costs, Shares |
|
|
2,000,000
|
|
|
|
|
Stock-based compensation expense |
3,112
|
|
|
3,112
|
|
|
|
Net unrealized gain (loss) on available-for- sale securities |
(161)
|
|
|
|
(161)
|
|
|
Net income (loss) |
17,139
|
|
|
|
|
17,139
|
|
Balances at Sep. 30, 2020 |
$ 244,119
|
|
$ 38
|
$ 412,173
|
$ 237
|
$ (168,329)
|
|
Common Stock Balance, Shares at Sep. 30, 2020 |
|
|
38,092,978
|
|
|
|
|