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CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Redeemable convertible preferred stock, beginning balance at Dec. 31, 2015 | $ 178,785 |  |  |
Redeemable convertible preferred stock, beginning balance (in shares) at Dec. 31, 2015 | 65,464,387 |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Conversion of redeemable convertible preferred stock in connection with the initial public offering | $ 0 |  |  |
Redeemable convertible preferred stock, ending balance (in shares) at Dec. 31, 2016 | 65,464,387 |  |  |
Redeemable convertible preferred stock, ending balance at Dec. 31, 2016 | $ 178,785 |  |  |
Beginning balance at Dec. 31, 2015 | (21,434) | $ 3 | $ 81,799 | $ (103,236)
Beginning balance (in shares) at Dec. 31, 2015 |  | 31,905,645 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance of common stock upon exercise of stock options and common stock warrants | $ 270 |  | 270 |
Issuance of common stock upon exercise of stock options (in shares) | 272,591 | 272,591 |  |
Stock-based compensation expense | $ 7,266 |  | 7,266 |
Conversion of redeemable convertible preferred stock warrant in connection with the initial public offering | 0 |  |  |
Net loss | (16,233) |  |  | (16,233)
Ending balance at Dec. 31, 2016 | (30,131) | $ 3 | 89,335 | (119,469)
Ending balance (in shares) at Dec. 31, 2016 |  | 32,178,236 |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Exercise of warrant on redeemable convertible preferred stock and related reclassification of redeemable convertible preferred stock warrant liability | $ 404 |  |  |
Exercise of warrant on redeemable convertible preferred stock and related reclassification of redeemable convertible preferred stock warrant liability (in shares) | 83,181 |  |  |
Repurchase and retirement of redeemable convertible preferred stock | $ (12,703) |  |  |
Repurchase and retirement of redeemable convertible preferred stock (in shares) | (4,268,489) |  |  |
Conversion of redeemable convertible preferred stock in connection with the initial public offering | $ 0 |  |  |
Redeemable convertible preferred stock, ending balance (in shares) at Dec. 31, 2017 | 61,279,079 |  |  |
Redeemable convertible preferred stock, ending balance at Dec. 31, 2017 | $ 166,486 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance of common stock upon exercise of stock options and common stock warrants | $ 2,547 |  | 2,547 |
Issuance of common stock upon exercise of stock options (in shares) | 1,554,944 | 1,554,944 |  |
Issuance of common stock to consultants (in shares) |  | 7,143 |  |
Repurchase and retirement of redeemable convertible preferred stock | $ (6,506) |  | (6,506) |
Stock-based compensation expense | 6,846 |  | 6,846 |
Conversion of redeemable convertible preferred stock warrant in connection with the initial public offering | 0 |  |  |
Net loss | (4,123) |  |  | (4,123)
Ending balance at Dec. 31, 2017 | (31,367) | $ 3 | 92,222 | (123,592)
Ending balance (in shares) at Dec. 31, 2017 |  | 33,740,323 |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Conversion of redeemable convertible preferred stock in connection with the initial public offering | $ (166,486) |  |  |
Conversion of redeemable convertible preferred stock in connection with the initial public offering (in shares) | (61,279,079) |  |  |
Redeemable convertible preferred stock, ending balance (in shares) at Dec. 31, 2018 | 0 |  |  |
Redeemable convertible preferred stock, ending balance at Dec. 31, 2018 | $ 0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance of common stock upon exercise of stock options and common stock warrants | $ 8,160 | $ 1 | 8,159 |
Issuance of common stock upon exercise of stock options (in shares) | 3,522,631 | 3,567,917 |  |
Stock-based compensation expense | $ 10,361 |  | 10,361 |
Issuance of common stock in connection with the initial public offering, net of discounts and commissions | 109,381 | $ 1 | 109,380 |
Issuance of common stock in connection with the initial public offering, net of discounts and commissions (in shares) |  | 7,840,908 |  |
Costs related to the initial public offering | (6,282) |  | (6,282) |
Conversion of redeemable convertible preferred stock warrant in connection with the initial public offering | 7,160 |  | 7,160 |
Conversion of redeemable convertible preferred stock in connection with the initial public offering | 166,486 | $ 6 | 166,480 |
Conversion of redeemable convertible preferred stock in connection with the initial public offering (in shares) |  | 61,279,079 |  |
Issuance of common stock for settlement of RSUs (in shares) |  | 38,742 |  |
Shares withheld related to net share settlement of RSUs | (247) |  | (247) |
Shares withheld related to net share settlement of RSUs (in shares) |  | (12,648) |  |
Net loss | (19,907) |  |  | (19,907)
Ending balance at Dec. 31, 2018 | $ 243,745 | $ 11 | $ 387,233 | $ (143,499)
Ending balance (in shares) at Dec. 31, 2018 |  | 106,454,321 |  |

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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(29)) -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 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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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 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 Redemption of temporary equity as the result of a triggering event associated with the temporary equity. + 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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