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v3.20.2

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2018 | 40,863 |  |  |
Balance at Dec. 31, 2018 | $ 41 | $ 313,800 | $ (234,086) | $ 79,755
Issuance of common stock upon exercise of stock options and vesting of restricted stock units (in shares) | 987 |  |  |
Issuance of common stock upon exercise of stock options and vesting of restricted stock units | $ 1 | 6,907 | 0 | 6,908
Tax portion of vested restricted stock units | 0 | (676) | 0 | (676)
Stock-based compensation expense (employee) | 0 | 3,932 | 0 | 3,932
Stock-based compensation expense (non-employee) | 0 | 75 | 0 | 75
Stock-based compensation expense (ESPP) | 0 | 318 | 0 | 318
Net loss and comprehensive loss | $ 0 | 0 | (4,411) | (4,411)
Issuance of common stock under employee stock purchase plan (ESPP) (in shares) | 80 |  |  |
Issuance of common stock under employee stock purchase plan (ESPP) | $ 0 | 491 | 0 | 491
Sale of common stock in a public offering, net of issuance costs of $9,208 (in shares) | 6,325 |  |  |
Sale of common stock in a public offering, net of issuance costs of $9,208 | $ 6 | 137,842 | 0 | 137,848
Balance (in shares) at Jun. 30, 2019 | 48,255 |  |  |
Balance at Jun. 30, 2019 | $ 48 | 462,689 | (238,497) | 224,240
Balance (in shares) at Mar. 31, 2019 | 41,509 |  |  |
Balance at Mar. 31, 2019 | $ 42 | 319,733 | (236,003) | 83,772
Issuance of common stock upon exercise of stock options and vesting of restricted stock units (in shares) | 421 |  |  |
Issuance of common stock upon exercise of stock options and vesting of restricted stock units | $ 0 | 2,668 | 0 | 2,668
Tax portion of vested restricted stock units | 0 | (120) | 0 | (120)
Stock-based compensation expense (employee) | 0 | 2,334 | 0 | 2,334
Stock-based compensation expense (non-employee) | 0 | 55 | 0 | 55
Stock-based compensation expense (ESPP) | 0 | 177 | 0 | 177
Net loss and comprehensive loss | $ 0 | 0 | (2,494) | (2,494)
Sale of common stock in a public offering, net of issuance costs of $9,208 (in shares) | 6,325 |  |  |
Sale of common stock in a public offering, net of issuance costs of $9,208 | $ 6 | 137,842 | 0 | 137,848
Balance (in shares) at Jun. 30, 2019 | 48,255 |  |  |
Balance at Jun. 30, 2019 | $ 48 | 462,689 | (238,497) | 224,240
Balance (in shares) at Dec. 31, 2019 | 49,625 |  |  |
Balance at Dec. 31, 2019 | $ 50 | 486,090 | (246,685) | 239,455
Issuance of common stock upon exercise of stock options and vesting of restricted stock units (in shares) | 760 |  |  |
Issuance of common stock upon exercise of stock options and vesting of restricted stock units | $ 0 | 4,745 | 0 | 4,745
Tax portion of vested restricted stock units | 0 | (2,678) | 0 | (2,678)
Stock-based compensation expense (employee) | 0 | 5,560 | 0 | 5,560
Stock-based compensation expense (non-employee) | 0 | 20 | 0 | 20
Stock-based compensation expense (ESPP) | 0 | 685 | 0 | 685
Net loss and comprehensive loss | $ 0 | 0 | (22,741) | (22,741)
Issuance of common stock under employee stock purchase plan (ESPP) (in shares) | 61 |  |  |
Issuance of common stock under employee stock purchase plan (ESPP) | $ 0 | 1,101 | 0 | 1,101
Balance (in shares) at Jun. 30, 2020 | 50,446 |  |  |
Balance at Jun. 30, 2020 | $ 50 | 495,523 | (269,426) | 226,147
Balance (in shares) at Mar. 31, 2020 | 50,000 |  |  |
Balance at Mar. 31, 2020 | $ 50 | 488,773 | (258,401) | 230,422
Issuance of common stock upon exercise of stock options and vesting of restricted stock units (in shares) | 446 |  |  |
Issuance of common stock upon exercise of stock options and vesting of restricted stock units | $ 0 | 3,764 | 0 | 3,764
Tax portion of vested restricted stock units | 0 | (374) | 0 | (374)
Stock-based compensation expense (employee) | 0 | 3,009 | 0 | 3,009
Stock-based compensation expense (non-employee) | 0 | 20 | 0 | 20
Stock-based compensation expense (ESPP) | 0 | 331 | 0 | 331
Net loss and comprehensive loss | $ 0 | 0 | (11,025) | (11,025)
Balance (in shares) at Jun. 30, 2020 | 50,446 |  |  |
Balance at Jun. 30, 2020 | $ 50 | $ 495,523 | $ (269,426) | $ 226,147

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