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v3.20.1

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 738 | $ 566,913 | $ (12) | $ (566,061) | $ 1,578
Net loss |  |  |  | (65,782) | (65,782)
Other comprehensive income (loss) |  |  | (231) |  | (231)
Exercise of stock options | 6 | 1,230 |  |  | 1,236
Employee stock purchase plan sales | 1 | 344 |  |  | 345
Issuance of common stock, net | 239 | 133,761 |  |  | 134,000
Stock-based compensation expense |  | 12,621 |  |  | 12,621
Balance at Dec. 31, 2017 | 984 | 714,869 | (243) | (631,843) | 83,767
Net loss |  |  |  | (101,252) | (101,252)
Other comprehensive income (loss) |  |  | (54) |  | (54)
Exercise of stock options | 11 | 2,490 |  |  | 2,501
Employee stock purchase plan sales | 1 | 350 |  |  | 351
Issuance of common stock, net | 105 | 53,295 |  |  | 53,400
Stock-based compensation expense |  | 9,396 |  |  | 9,396
Impact to retained earnings from adoption of new standard at Dec. 31, 2017 |  |  |  | 1,126 | 1,126
Balance at Dec. 31, 2018 | 1,101 | 780,400 | (297) | (731,969) | 49,235
Net loss |  |  |  | (108,897) | (108,897)
Other comprehensive income (loss) |  |  | 336 |  | 336
Exercise of stock options | 3 | 832 |  |  | 835
Employee stock purchase plan sales | 1 | 403 |  |  | 404
Issuance of common stock, net | 436 | 58,064 |  |  | 58,500
Stock-based compensation expense |  | 17,719 |  |  | 17,719
Impact to retained earnings from adoption of new standard at Dec. 31, 2018 |  |  |  | 238 | 238
Issuance of pre-funded warrants, 11,765 warrants |  | 19,882 |  |  | 19,882
Balance at Dec. 31, 2019 | $ 1,541 | $ 877,300 | $ 39 | $ (840,628) | $ 38,252

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