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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | 2019 Convertible Senior Notes | 2023 Convertible Senior Notes | Common Stock | Additional paid-in capital | Additional paid-in capital 2019 Convertible Senior Notes | Additional paid-in capital 2023 Convertible Senior Notes | Accumulated other comprehensive income (loss) | Accumulated deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (shares) at Dec. 31, 2015 |  |  |  | 19,949,012 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2015 | $ 237,282 |  |  | $ 20 | $ 661,850 |  |  | $ 4,903 | $ (429,491)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  | 210,626 |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 5,416 |  |  |  | 5,416 |  |  |  |
Shares issued in OMT acquisition (shares) |  |  |  | 790,163 |  |  |  |  |
Shares issued in OMT acquisition | 77,331 |  |  | $ 1 | 77,330 |  |  |  |
Reclassification of equity component of currently redeemable convertible notes | 10,065 |  |  |  | 10,065 |  |  |  |
Stock-based compensation | $ 18,893 |  |  |  | 18,893 |  |  |  |
Repurchase of common stock (shares) | (40,500) |  |  | (40,500) |  |  |  |  |
Repurchase of common stock | $ (3,901) |  |  |  | (3,901) |  |  |  |
Other comprehensive income (loss) | (2,160) |  |  |  |  |  |  | (2,160) |
Net income (loss) | (1,636) |  |  |  |  |  |  |  | (1,636)
Balance at end of period (shares) at Dec. 31, 2016 |  |  |  | 20,909,301 |  |  |  |  |
Balance at end of period at Dec. 31, 2016 | 341,290 |  |  | $ 21 | 769,653 |  |  | 2,743 | (431,127)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  | 253,364 |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | (5,558) |  |  |  | (5,558) |  |  |  |
Shares issued in OMT acquisition | 0 |  |  |  |  |  |  |  |
Reclassification of equity component of currently redeemable convertible notes | 10,704 |  |  |  | 10,704 |  |  |  |
Stock-based compensation | $ 24,916 |  |  |  | 24,916 |  |  |  |
Repurchase of common stock (shares) | (14,000) |  |  | (14,000) |  |  |  |  |
Repurchase of common stock | $ (1,966) |  |  |  | (1,966) |  |  |  |
Other comprehensive income (loss) | (257) |  |  |  |  |  |  | (257) |
Net income (loss) | 12,556 |  |  |  |  |  |  |  | 12,556
Balance at end of period (shares) at Dec. 31, 2017 |  |  |  | 21,148,665 |  |  |  |  |
Balance at end of period at Dec. 31, 2017 | 399,788 |  |  | $ 21 | 798,205 |  |  | 2,486 | (400,924)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  | 399,116 |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 16,417 |  |  |  | 16,417 |  |  |  |
Shares issued in OMT acquisition | 0 |  |  |  |  |  |  |  |
Reclassification of equity component of currently redeemable convertible notes | 18,859 |  |  |  | 18,859 |  |  |  |
Stock-based compensation | $ 20,846 |  |  |  | 20,846 |  |  |  |
Repurchase of common stock (shares) | (782,248) |  |  | (782,248) |  |  |  |  |
Repurchase of common stock | $ (127,481) |  |  |  | (127,481) |  |  |  |
Other comprehensive income (loss) | 73 |  |  |  |  |  |  | 73 |
Convertible bond hedge and warrant transactions, net of tax |  | $ (1,559) | $ (1,807) |  |  | $ (1,559) | $ (1,807) |  |
Loss on settlement of Notes |  | 3,187 |  |  |  | 3,187 |  |  |
Warrant repurchase |  | (30,472) |  |  |  | (30,472) |  |  |
Loss on repurchase of warrants |  | 1,792 |  |  |  | 1,792 |  |  |
Tax effect for Notes transactions |  | $ (1,680) | (3,181) |  |  | $ (1,680) | (3,181) |  |
Warrant derivative |  |  | $ 97,805 |  |  |  | $ 97,805 |  |
Foreign currency translation adjustment | (921) |  |  |  |  |  |  | (921) |
Other tax reclassifications | 346 |  |  |  | 183 |  |  |  | 163
Net income (loss) | 143,321 |  |  |  |  |  |  |  | 143,321
Balance at end of period (shares) at Dec. 31, 2018 |  |  |  | 20,765,533 |  |  |  |  |
Balance at end of period at Dec. 31, 2018 | $ 560,914 |  |  | $ 21 | $ 791,114 |  |  | $ (1,024) | $ (229,197)

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant