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CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income | Accumulated Deficit | Series A Redeemable Convertible Preferred Stock | Series B Redeemable Convertible Preferred Stock
--- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  |  |  |  |  | 15,848 | 39,538
Balance at Dec. 31, 2017 |  |  |  |  |  | $ 49,935 | $ 227,800
Redeemable Convertible Preferred Stock [Roll Forward] |  |  |  |  |  |  |
Accretion of Series A and B redeemable convertible preferred stock |  |  |  |  |  | $ 11 | $ 368
Balance (in shares) at Jun. 30, 2018 |  |  |  |  |  | 15,848 | 39,538
Balance at Jun. 30, 2018 |  |  |  |  |  | $ 49,946 | $ 228,168
Balance (in shares) at Dec. 31, 2017 |  | 24,472 |  |  |  |  |
Balance at Dec. 31, 2017 | $ (371,665) | $ 246 | $ 20,676 | $ 0 | $ (392,587) |  |
Increase (Decrease) in Stockholders' Deficit [Roll Forward] |  |  |  |  |  |  |
Accretion of Series A and B redeemable convertible preferred stock | (379) |  | (379) |  |  |  |
Exercise of stock options (in shares) |  | 486 |  |  |  |  |
Exercise of stock options | 1,010 | $ 5 | 1,005 |  |  |  |
Repurchase of common stock (in shares) |  | (7) |  |  |  |  |
Repurchase of common stock | (75) | $ (1) | (74) |  |  |  |
Stock-based compensation | 5,423 |  | 5,423 |  |  |  |
Other comprehensive income | 0 |  |  |  |  |  |
Net loss | (33,038) |  |  |  | (33,038) |  |
Balance (in shares) at Jun. 30, 2018 |  | 24,951 |  |  |  |  |
Balance at Jun. 30, 2018 | (398,724) | $ 250 | 26,651 | 0 | (425,625) |  |
Balance (in shares) at Mar. 31, 2018 |  |  |  |  |  | 15,848 | 39,538
Balance at Mar. 31, 2018 |  |  |  |  |  | $ 49,940 | $ 227,983
Redeemable Convertible Preferred Stock [Roll Forward] |  |  |  |  |  |  |
Accretion of Series A and B redeemable convertible preferred stock |  |  |  |  |  | $ 6 | $ 185
Balance (in shares) at Jun. 30, 2018 |  |  |  |  |  | 15,848 | 39,538
Balance at Jun. 30, 2018 |  |  |  |  |  | $ 49,946 | $ 228,168
Balance (in shares) at Mar. 31, 2018 |  | 24,794 |  |  |  |  |
Balance at Mar. 31, 2018 | (384,863) | $ 249 | 23,363 | 0 | (408,475) |  |
Increase (Decrease) in Stockholders' Deficit [Roll Forward] |  |  |  |  |  |  |
Accretion of Series A and B redeemable convertible preferred stock | (191) |  | (191) |  |  |  |
Exercise of stock options (in shares) |  | 164 |  |  |  |  |
Exercise of stock options | 531 | $ 2 | 529 |  |  |  |
Repurchase of common stock (in shares) |  | (7) |  |  |  |  |
Repurchase of common stock | (75) | $ (1) | (74) |  |  |  |
Stock-based compensation | 3,024 |  | 3,024 |  |  |  |
Other comprehensive income | 0 |  |  |  |  |  |
Net loss | (17,150) |  |  |  | (17,150) |  |
Balance (in shares) at Jun. 30, 2018 |  | 24,951 |  |  |  |  |
Balance at Jun. 30, 2018 | $ (398,724) | $ 250 | 26,651 | 0 | (425,625) |  |
Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  | 0 | 0
Balance at Dec. 31, 2018 |  |  |  |  |  | $ 0 | $ 0
Balance (in shares) at Jun. 30, 2019 |  |  |  |  |  | 0 | 0
Balance at Jun. 30, 2019 |  |  |  |  |  | $ 0 | $ 0
Balance (in shares) at Dec. 31, 2018 | 93,126 | 93,126 |  |  |  |  |
Balance at Dec. 31, 2018 | $ 121,763 | $ 931 | 586,940 | 0 | (466,108) |  |
Increase (Decrease) in Stockholders' Deficit [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options (in shares) | 3,242 | 3,242 |  |  |  |  |
Exercise of stock options | $ 12,727 | $ 32 | 12,695 |  |  |  |
Vesting of restricted stock units (in shares) |  | 1 |  |  |  |  |
Vesting of restricted stock units | 0 |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 439 |  |  |  |  |
Issuance of common stock under employee stock purchase plan | 8,579 | $ 5 | 8,574 |  |  |  |
Stock-based compensation | 20,878 |  | 20,878 |  |  |  |
Other comprehensive income | 80 |  |  | 80 |  |  |
Net loss | $ (43,068) |  |  |  | (43,068) |  |
Balance (in shares) at Jun. 30, 2019 | 96,808 | 96,808 |  |  |  |  |
Balance at Jun. 30, 2019 | $ 120,959 | $ 968 | 629,087 | 80 | (509,176) |  |
Balance (in shares) at Mar. 31, 2019 |  |  |  |  |  | 0 | 0
Balance at Mar. 31, 2019 |  |  |  |  |  | $ 0 | $ 0
Balance (in shares) at Jun. 30, 2019 |  |  |  |  |  | 0 | 0
Balance at Jun. 30, 2019 |  |  |  |  |  | $ 0 | $ 0
Balance (in shares) at Mar. 31, 2019 |  | 96,203 |  |  |  |  |
Balance at Mar. 31, 2019 | 128,209 | $ 962 | 614,774 | 21 | (487,548) |  |
Increase (Decrease) in Stockholders' Deficit [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 604 |  |  |  |  |
Exercise of stock options | 2,849 | $ 6 | 2,843 |  |  |  |
Vesting of restricted stock units (in shares) |  | 1 |  |  |  |  |
Vesting of restricted stock units | 0 |  |  |  |  |  |
Stock-based compensation | 11,470 |  | 11,470 |  |  |  |
Other comprehensive income | 59 |  |  | 59 |  |  |
Net loss | $ (21,628) |  |  |  | (21,628) |  |
Balance (in shares) at Jun. 30, 2019 | 96,808 | 96,808 |  |  |  |  |
Balance at Jun. 30, 2019 | $ 120,959 | $ 968 | $ 629,087 | $ 80 | $ (509,176) |  |

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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 Value of accretion of temporary equity to its redemption value during the period. + References No definition available. + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: 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(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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