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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Convertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 5,786 |  |  | $ 62 | $ 1,184,783 | $ (1,179,059)
Balance (in shares) at Dec. 31, 2017 |  |  | 5 | 8,249 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options | 14 |  |  |  | 14 |
Issuance of common stock related to 401(k) contribution | 20 |  |  |  | 20 |
Issuance of common stock related to 401(k) contribution (in shares) |  |  |  | 1 |  |
Vesting of restricted stock units (in shares) |  |  |  | 14 |  |
Stock-based compensation expense | 1,416 |  |  |  | 1,416 |
Issuance of common stock | 2,207 |  |  |  | 2,207 |
Issuance of common stock (in shares) |  |  |  | 68 |  |
Net income (loss) and comprehensive income (loss) | (3,806) |  |  |  |  | (3,806)
Balance at Mar. 31, 2018 | 5,637 |  |  | $ 62 | 1,188,440 | (1,182,865)
Balance (in shares) at Mar. 31, 2018 |  |  | 5 | 8,332 |  |
Balance at Dec. 31, 2017 | 5,786 |  |  | $ 62 | 1,184,783 | (1,179,059)
Balance (in shares) at Dec. 31, 2017 |  |  | 5 | 8,249 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) and comprehensive income (loss) | (10,331) |  |  |  |  |
Balance at Sep. 30, 2018 | 1,153 |  |  | $ 63 | 1,190,480 | (1,189,390)
Balance (in shares) at Sep. 30, 2018 |  |  | 5 | 8,387 |  |
Balance at Mar. 31, 2018 | 5,637 |  |  | $ 62 | 1,188,440 | (1,182,865)
Balance (in shares) at Mar. 31, 2018 |  |  | 5 | 8,332 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options | 231 |  |  | $ 1 | 230 |
Exercise of stock options (in shares) |  |  |  | 44 |  |
Issuance of common stock related to ESPP | 22 |  |  |  | 22 |
Issuance of common stock related to ESPP (in shares) |  |  |  | 1 |  |
Vesting of restricted stock units (in shares) |  |  |  | 2 |  |
Stock-based compensation expense | 770 |  |  |  | 770 |
Issuance of warrants | 139 |  |  |  | 139 |
Net income (loss) and comprehensive income (loss) | (1,947) |  |  |  |  | (1,947)
Balance at Jun. 30, 2018 | 4,852 |  |  | $ 63 | 1,189,601 | (1,184,812)
Balance (in shares) at Jun. 30, 2018 |  |  | 5 | 8,379 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options | 32 |  |  |  | 32 |
Exercise of stock options (in shares) |  |  |  | 8 |  |
Stock-based compensation expense | 847 |  |  |  | 847 |
Net income (loss) and comprehensive income (loss) | (4,578) |  |  |  |  | (4,578)
Balance at Sep. 30, 2018 | 1,153 |  |  | $ 63 | 1,190,480 | (1,189,390)
Balance (in shares) at Sep. 30, 2018 |  |  | 5 | 8,387 |  |
Balance at Dec. 31, 2018 | 18,785 | [1] |  | $ 65 | 1,211,122 | (1,192,402)
Balance (in shares) at Dec. 31, 2018 |  |  | 6 | 8,691 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options | 115 |  |  |  | 115 |
Exercise of stock options (in shares) |  |  |  | 24 |  |
Issuance of common stock related to 401(k) contribution | 102 |  |  |  | 102 |
Issuance of common stock related to 401(k) contribution (in shares) |  |  |  | 7 |  |
Vesting of restricted stock units (in shares) |  |  |  | 2 |  |
Stock-based compensation expense | 1,728 |  |  |  | 1,728 |
Issuance of warrants | 66 |  |  |  | 66 |
Net income (loss) and comprehensive income (loss) | 3,233 |  |  |  |  | 3,233
Balance at Mar. 31, 2019 | 24,029 |  |  | $ 65 | 1,213,133 | (1,189,169)
Balance (in shares) at Mar. 31, 2019 |  |  | 6 | 8,724 |  |
Balance at Dec. 31, 2018 | 18,785 | [1] |  | $ 65 | 1,211,122 | (1,192,402)
Balance (in shares) at Dec. 31, 2018 |  |  | 6 | 8,691 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) and comprehensive income (loss) | 2,339 |  |  |  |  |
Balance at Sep. 30, 2019 | 25,786 |  |  | $ 65 | 1,215,784 | (1,190,063)
Balance (in shares) at Sep. 30, 2019 |  |  | 6 | 8,752 |  |
Balance at Mar. 31, 2019 | 24,029 |  |  | $ 65 | 1,213,133 | (1,189,169)
Balance (in shares) at Mar. 31, 2019 |  |  | 6 | 8,724 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options | 8 |  |  |  | 8 |
Exercise of stock options (in shares) |  |  |  | 2 |  |
Issuance of common stock related to ESPP | 16 |  |  |  | 16 |
Issuance of common stock related to ESPP (in shares) |  |  |  | 2 |  |
Stock-based compensation expense | 1,011 |  |  |  | 1,011 |
Net income (loss) and comprehensive income (loss) | (4,072) |  |  |  |  | (4,072)
Balance at Jun. 30, 2019 | 20,992 |  |  | $ 65 | 1,214,168 | (1,193,241)
Balance (in shares) at Jun. 30, 2019 |  |  | 6 | 8,728 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options | 122 |  |  |  | 122 |
Exercise of stock options (in shares) |  |  |  | 24 |  |
Stock-based compensation expense | 1,494 |  |  |  | 1,494 |
Net income (loss) and comprehensive income (loss) | 3,178 |  |  |  |  | 3,178
Balance at Sep. 30, 2019 | $ 25,786 |  |  | $ 65 | $ 1,215,784 | $ (1,190,063)
Balance (in shares) at Sep. 30, 2019 |  |  | 6 | 8,752 |  |
[1] | The consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Refers to release of restricted stock units (RSUs) in shares during the period. + References No definition available. + Details
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