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v3.20.2

Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ 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
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (shares) at Dec. 31, 2018 |  |  | 49,338 |  |  |  |
Beginning Balance at Dec. 31, 2018 | $ 72,116 |  | $ 49 | $ 631,605 | $ (687) | $ (558,851) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock on bond conversion (shares) |  |  | 19,460 |  |  |  |
Issuance of common stock on bond conversion | 133,298 |  | $ 19 | 133,279 |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other (shares) |  |  | 140 |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other | (176) |  | $ 1 | (177) |  |  |
Issuance of common stock from option exercises (shares) |  |  | 53 |  |  |  |
Issuance of common stock from option exercises | 255 |  |  | 255 |  |  |
Stock-based compensation expense | 2,207 |  |  | 2,207 |  |  |
Net loss | (25,465) |  |  |  |  | (25,465) |
Other comprehensive income, net of tax | 10 |  |  |  | 10 |  |
Ending Balance (shares) at Mar. 31, 2019 |  |  | 68,991 |  |  |  |
Ending Balance at Mar. 31, 2019 | 182,245 |  | $ 69 | 767,169 | (677) | (584,316) |
Beginning Balance (shares) at Dec. 31, 2018 |  |  | 49,338 |  |  |  |
Beginning Balance at Dec. 31, 2018 | 72,116 |  | $ 49 | 631,605 | (687) | (558,851) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (52,105) |  |  |  |  |  |
Other comprehensive income, net of tax | (71) |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2019 |  |  | 69,550 |  |  |  |
Ending Balance at Sep. 30, 2019 | 162,605 |  | $ 70 | 774,249 | (758) | (610,956) |
Beginning Balance (shares) at Dec. 31, 2018 |  |  | 49,338 |  |  |  |
Beginning Balance at Dec. 31, 2018 | $ 72,116 |  | $ 49 | 631,605 | (687) | (558,851) |
Ending Balance (shares) at Dec. 31, 2019 | 69,956 |  | 69,956 |  |  |  |
Ending Balance at Dec. 31, 2019 | $ 153,612 | $ (100) | $ 70 | 777,765 | (582) | (623,641) | $ (100)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |
Beginning Balance (shares) at Mar. 31, 2019 |  |  | 68,991 |  |  |  |
Beginning Balance at Mar. 31, 2019 | $ 182,245 |  | $ 69 | 767,169 | (677) | (584,316) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other (shares) |  |  | 183 |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other | (325) |  |  | (325) |  |  |
Issuance of common stock from option exercises (shares) |  |  | 130 |  |  |  |
Issuance of common stock from option exercises | 793 |  |  | 793 |  |  |
Issuance of common stock under ESPP (shares) |  |  | 96 |  |  |  |
Issuance of common stock under ESPP | 641 |  |  | 641 |  |  |
Stock-based compensation expense | 2,985 |  |  | 2,985 |  |  |
Net loss | (13,753) |  |  |  |  | (13,753) |
Other comprehensive income, net of tax | 54 |  |  |  | 54 |  |
Ending Balance (shares) at Jun. 30, 2019 |  |  | 69,400 |  |  |  |
Ending Balance at Jun. 30, 2019 | 172,640 |  | $ 69 | 771,263 | (623) | (598,069) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other (shares) |  |  | 149 |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other | (69) |  | $ 1 | (70) |  |  |
Issuance of common stock from option exercises (shares) |  |  | 1 |  |  |  |
Issuance of common stock from option exercises | 1 |  |  | 1 |  |  |
Stock-based compensation expense | 3,055 |  |  | 3,055 |  |  |
Net loss | (12,887) |  |  |  |  | (12,887) |
Other comprehensive income, net of tax | (135) |  |  |  | (135) |  |
Ending Balance (shares) at Sep. 30, 2019 |  |  | 69,550 |  |  |  |
Ending Balance at Sep. 30, 2019 | $ 162,605 |  | $ 70 | 774,249 | (758) | (610,956) |
Beginning Balance (shares) at Dec. 31, 2019 | 69,956 |  | 69,956 |  |  |  |
Beginning Balance at Dec. 31, 2019 | $ 153,612 | (100) | $ 70 | 777,765 | (582) | (623,641) | (100)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other (shares) |  |  | 255 |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other | (146) |  |  | (146) |  |  |
Stock-based compensation expense | 2,364 |  |  | 2,364 |  |  |
Acquisition of InstruNor AS (shares) |  |  | 485 |  |  |  |
Acquisition of InstruNor AS | 2,049 |  | $ 1 | 2,048 |  |  |
Net loss | (15,980) |  |  |  |  | (15,980) |
Other comprehensive income, net of tax | (303) |  |  |  | (303) |  |
Ending Balance (shares) at Mar. 31, 2020 |  |  | 70,696 |  |  |  |
Ending Balance at Mar. 31, 2020 | $ 141,496 |  | $ 71 | 782,031 | (885) | (639,721) |
Beginning Balance (shares) at Dec. 31, 2019 | 69,956 |  | 69,956 |  |  |  |
Beginning Balance at Dec. 31, 2019 | $ 153,612 | $ (100) | $ 70 | 777,765 | (582) | (623,641) | $ (100)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock from option exercises (shares) | 98 |  |  |  |  |  |
Net loss | $ (34,994) |  |  |  |  |  |
Other comprehensive income, net of tax | $ 293 |  |  |  |  |  |
Ending Balance (shares) at Sep. 30, 2020 | 74,115 |  | 74,115 |  |  |  |
Ending Balance at Sep. 30, 2020 | $ 151,973 |  | $ 74 | 810,923 | (289) | (658,735) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |
Beginning Balance (shares) at Mar. 31, 2020 |  |  | 70,696 |  |  |  |
Beginning Balance at Mar. 31, 2020 | $ 141,496 |  | $ 71 | 782,031 | (885) | (639,721) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other (shares) |  |  | 286 |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other | (116) |  |  | (116) |  |  |
Issuance of common stock under ESPP (shares) |  |  | 301 |  |  |  |
Issuance of common stock under ESPP | 645 |  |  | 645 |  |  |
Stock-based compensation expense | 3,633 |  |  | 3,633 |  |  |
Net loss | (13,015) |  |  |  |  | (13,015) |
Other comprehensive income, net of tax | 76 |  |  |  | 76 |  |
Ending Balance (shares) at Jun. 30, 2020 |  |  | 71,283 |  |  |  |
Ending Balance at Jun. 30, 2020 | 132,719 |  | $ 71 | 786,193 | (809) | (652,736) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other (shares) |  |  | 258 |  |  |  |
Issuance of restricted stock, net of shares withheld for taxes, and other | (123) |  | $ 1 | (124) |  |  |
Issuance of common stock from option exercises (shares) |  |  | 94 |  |  |  |
Issuance of common stock from option exercises | 450 |  |  | 450 |  |  |
Issuance of common stock from at-the-market offering, net of issuance costs (in shares) |  |  | 2,480 |  |  |  |
Issuance of common stock from at-the-market offering, net of issuance costs | 20,228 |  | $ 2 | 20,226 |  |  |
Equity issuance costs | (180) |  |  | (180) |  |  |
Stock-based compensation expense | 4,358 |  |  | 4,358 |  |  |
Net loss | (5,999) |  |  |  |  | (5,999) |
Other comprehensive income, net of tax | $ 520 |  |  |  | 520 |  |
Ending Balance (shares) at Sep. 30, 2020 | 74,115 |  | 74,115 |  |  |  |
Ending Balance at Sep. 30, 2020 | $ 151,973 |  | $ 74 | $ 810,923 | $ (289) | $ (658,735) |

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