Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands |
Total |
Common Stock |
Additional Paid-in Capital |
Accumulated Other Comprehensive Income (Loss) |
Accumulated Deficit |
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 (loss) gain on available-for- sale securities |
(137)
|
|
|
(137)
|
|
Net (loss) income |
(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
|
|
|
|
Net unrealized (loss) gain on available-for- sale securities |
72
|
|
|
|
|
Net (loss) income |
27,416
|
|
|
|
|
Balances at Sep. 30, 2020 |
244,119
|
$ 38
|
412,173
|
237
|
(168,329)
|
Common Stock Balance, Shares at Sep. 30, 2020 |
|
37,983,978
|
|
|
|
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 |
257,834
|
|
|
|
|
Balances at Dec. 31, 2020 |
$ 332,048
|
$ 46
|
559,746
|
129
|
(227,873)
|
Common Stock Balance, Shares at Dec. 31, 2020 |
|
45,752,116
|
|
|
|
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 (loss) gain on available-for- sale securities |
370
|
|
|
370
|
|
Net (loss) income |
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 |
|
12,527
|
|
|
|
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)
|
|
|
|
Stock-based compensation expense |
3,112
|
|
3,112
|
|
|
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
|
|
|
|
Net unrealized (loss) gain on available-for- sale securities |
(161)
|
|
|
(161)
|
|
Net (loss) income |
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 |
|
37,983,978
|
|
|
|
Balances at Dec. 31, 2020 |
332,048
|
$ 46
|
559,746
|
129
|
(227,873)
|
Common Stock Balance, Shares at Dec. 31, 2020 |
|
45,752,116
|
|
|
|
Exercise of common stock options |
1,360
|
|
1,360
|
|
|
Exercise of common stock options, Shares |
|
129,161
|
|
|
|
Issuance of common stock under Employee Stock Purchase Plan |
873
|
|
873
|
|
|
Issuance of common stock under Employee Stock Purchase Plan, Shares |
|
93,346
|
|
|
|
Vesting of restricted stock units |
|
147,349
|
|
|
|
Stock transaction associated with taxes withheld on restricted stock units |
(407)
|
|
(407)
|
|
|
Stock transaction associated with taxes withheld on restricted stock units,Shares |
|
(18,366)
|
|
|
|
Stock-based compensation expense |
3,952
|
|
3,952
|
|
|
Net unrealized (loss) gain on available-for- sale securities |
(129)
|
|
|
(129)
|
|
Net (loss) income |
(30,359)
|
|
|
|
(30,359)
|
Balances at Mar. 31, 2021 |
307,338
|
$ 46
|
565,524
|
|
(258,232)
|
Common Stock Balance, Shares at Mar. 31, 2021 |
|
46,103,606
|
|
|
|
Balances at Dec. 31, 2020 |
$ 332,048
|
$ 46
|
559,746
|
129
|
(227,873)
|
Common Stock Balance, Shares at Dec. 31, 2020 |
|
45,752,116
|
|
|
|
Exercise of common stock options, Shares |
257,834
|
|
|
|
|
Net unrealized (loss) gain on available-for- sale securities |
$ (159)
|
|
|
|
|
Net (loss) income |
(67,413)
|
|
|
|
|
Balances at Sep. 30, 2021 |
283,580
|
$ 46
|
578,850
|
(30)
|
(295,286)
|
Common Stock Balance, Shares at Sep. 30, 2021 |
|
46,261,060
|
|
|
|
Balances at Mar. 31, 2021 |
307,338
|
$ 46
|
565,524
|
|
(258,232)
|
Common Stock Balance, Shares at Mar. 31, 2021 |
|
46,103,606
|
|
|
|
Exercise of common stock options |
452
|
|
452
|
|
|
Exercise of common stock options, Shares |
|
40,902
|
|
|
|
Return and retirement of common stocks |
|
(6,804)
|
|
|
|
Vesting of restricted stock units |
|
3,750
|
|
|
|
Stock-based compensation expense |
5,907
|
|
5,907
|
|
|
Net unrealized (loss) gain on available-for- sale securities |
(45)
|
|
|
(45)
|
|
Net (loss) income |
(6,152)
|
|
|
|
(6,152)
|
Balances at Jun. 30, 2021 |
307,500
|
$ 46
|
571,883
|
(45)
|
(264,384)
|
Common Stock Balance, Shares at Jun. 30, 2021 |
|
46,141,454
|
|
|
|
Exercise of common stock options |
160
|
|
160
|
|
|
Exercise of common stock options, Shares |
|
15,911
|
|
|
|
Issuance of common stock under Employee Stock Purchase Plan |
892
|
|
892
|
|
|
Issuance of common stock under Employee Stock Purchase Plan, Shares |
|
52,463
|
|
|
|
Vesting of restricted stock units |
|
81,375
|
|
|
|
Stock transaction associated with taxes withheld on restricted stock units |
(580)
|
|
(580)
|
|
|
Stock transaction associated with taxes withheld on restricted stock units,Shares |
|
(30,143)
|
|
|
|
Stock-based compensation expense |
6,495
|
|
6,495
|
|
|
Net unrealized (loss) gain on available-for- sale securities |
15
|
|
|
15
|
|
Net (loss) income |
(30,902)
|
|
|
|
(30,902)
|
Balances at Sep. 30, 2021 |
$ 283,580
|
$ 46
|
$ 578,850
|
$ (30)
|
$ (295,286)
|
Common Stock Balance, Shares at Sep. 30, 2021 |
|
46,261,060
|
|
|
|