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v3.20.1

Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 79,755 | $ 41 | $ 313,800 | $ (234,086)
Balance (in shares) at Dec. 31, 2018 |  | 40,863 |  |
Increase (Decrease) in Stockholders' Equity [Rollforward] |  |  |  |
Issuance of common stock on exercise of stock options and vesting of restricted stock units | 4,240 | $ 1 | 4,239 |
Issuance of common stock on exercise of stock options and vesting of restricted stock units (in shares) |  | 566 |  |
Issuance of common stock under employee stock purchase plan (ESPP) | 491 |  | 491 |
Issuance of common stock under ESPP (in shares) |  | 80 |  |
Tax portion of vested restricted stock units | (556) |  | (556) |
Stock-based compensation expense (employee) | 1,598 |  | 1,598 |
Stock-based compensation expense (non-employee) | 20 |  | 20 |
Stock-based compensation expense (ESPP) | 141 |  | 141 |
Net loss | (1,917) |  |  |
Comprehensive loss | (1,917) |  |  | (1,917)
Balance at Mar. 31, 2019 | 83,772 | $ 42 | 319,733 | (236,003)
Balance (in shares) at Mar. 31, 2019 |  | 41,509 |  |
Balance at Dec. 31, 2019 | 239,455 | $ 50 | 486,090 | (246,685)
Balance (in shares) at Dec. 31, 2019 |  | 49,625 |  |
Increase (Decrease) in Stockholders' Equity [Rollforward] |  |  |  |
Issuance of common stock on exercise of stock options and vesting of restricted stock units | 981 |  | 981 |
Issuance of common stock on exercise of stock options and vesting of restricted stock units (in shares) |  | 314 |  |
Issuance of common stock under employee stock purchase plan (ESPP) | 1,101 |  | 1,101 |
Issuance of common stock under ESPP (in shares) |  | 61 |  |
Tax portion of vested restricted stock units | (2,304) |  | (2,304) |
Stock-based compensation expense (employee) | 2,551 |  | 2,551 |
Stock-based compensation expense (ESPP) | 354 |  | 354 |
Net loss | (11,716) |  |  |
Comprehensive loss | (11,716) |  |  | (11,716)
Balance at Mar. 31, 2020 | $ 230,422 | $ 50 | $ 488,773 | $ (258,401)
Balance (in shares) at Mar. 31, 2020 |  | 50,000 |  |

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