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CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Temporary equity shares outstanding, beginning of period (shares) at Dec. 31, 2017 | 11,871,578 |  |  |  |
Temporary equity, beginning of period at Dec. 31, 2017 | $ 118,548 |  |  |  |
Temporary equity shares outstanding, end of period (shares) at Mar. 31, 2018 | 11,871,578 |  |  |  |
Temporary equity, end of period at Mar. 31, 2018 | $ 118,548 |  |  |  |
Stockholders' equity (deficit), beginning of period (in shares) at Dec. 31, 2017 |  | 3,603,140 |  |  |
Stockholders' equity (deficit), beginning of period at Dec. 31, 2017 | (129,378) | $ 1 | $ 9,943 | $ 402 | $ (139,724)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock upon exercise of stock options, net of shares withheld (in shares) |  | 4,207 |  |  |
Issuance of common stock upon exercise of stock options, net of shares withheld | 18 |  | 18 |  |
Stock-based compensation | 391 |  | 391 |  |
Vesting of early exercised stock options | 20 |  | 20 |  |
Foreign currency translation | (21) |  |  | (21) |
Net loss | (4,201) |  |  |  | (4,201)
Stockholders' equity (deficit), ending of period (in shares) at Mar. 31, 2018 |  | 3,607,347 |  |  |
Stockholders' equity (deficit), ending of period at Mar. 31, 2018 | $ (133,171) | $ 1 | 10,372 | 381 | (143,925)
Temporary equity shares outstanding, beginning of period (shares) at Dec. 31, 2017 | 11,871,578 |  |  |  |
Temporary equity, beginning of period at Dec. 31, 2017 | $ 118,548 |  |  |  |
Temporary equity shares outstanding, end of period (shares) at Jun. 30, 2018 | 11,871,578 |  |  |  |
Temporary equity, end of period at Jun. 30, 2018 | $ 118,548 |  |  |  |
Stockholders' equity (deficit), beginning of period (in shares) at Dec. 31, 2017 |  | 3,603,140 |  |  |
Stockholders' equity (deficit), beginning of period at Dec. 31, 2017 | (129,378) | $ 1 | 9,943 | 402 | (139,724)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Foreign currency translation | 33 |  |  |  |
Unrealized gain on marketable securities | 0 |  |  |  |
Net loss | (7,348) |  |  |  |
Stockholders' equity (deficit), ending of period (in shares) at Jun. 30, 2018 |  | 3,707,268 |  |  |
Stockholders' equity (deficit), ending of period at Jun. 30, 2018 | $ (135,703) | $ 1 | 10,933 | 435 | (147,072)
Temporary equity shares outstanding, beginning of period (shares) at Mar. 31, 2018 | 11,871,578 |  |  |  |
Temporary equity, beginning of period at Mar. 31, 2018 | $ 118,548 |  |  |  |
Temporary equity shares outstanding, end of period (shares) at Jun. 30, 2018 | 11,871,578 |  |  |  |
Temporary equity, end of period at Jun. 30, 2018 | $ 118,548 |  |  |  |
Stockholders' equity (deficit), beginning of period (in shares) at Mar. 31, 2018 |  | 3,607,347 |  |  |
Stockholders' equity (deficit), beginning of period at Mar. 31, 2018 | (133,171) | $ 1 | 10,372 | 381 | (143,925)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock upon exercise of stock options, net of shares withheld (in shares) |  | 44,195 |  |  |
Issuance of common stock upon exercise of stock options, net of shares withheld | 190 |  | 190 |  |
Issuance of common stock upon exercises of unvested stock options (in shares) |  | 55,726 |  |  |
Issuance of common stock upon exercises of unvested stock options | 0 |  |  |  |
Stock-based compensation | 363 |  | 363 |  |
Vesting of early exercised stock options | 8 |  | 8 |  |
Foreign currency translation | 54 |  |  | 54 |
Unrealized gain on marketable securities | 0 |  |  |  |
Net loss | (3,147) |  |  |  | (3,147)
Stockholders' equity (deficit), ending of period (in shares) at Jun. 30, 2018 |  | 3,707,268 |  |  |
Stockholders' equity (deficit), ending of period at Jun. 30, 2018 | $ (135,703) | $ 1 | 10,933 | 435 | (147,072)
Temporary equity shares outstanding, beginning of period (shares) at Dec. 31, 2018 | 0 |  |  |  |
Temporary equity, beginning of period at Dec. 31, 2018 | $ 0 |  |  |  |
Temporary equity shares outstanding, end of period (shares) at Mar. 31, 2019 | 0 |  |  |  |
Temporary equity, end of period at Mar. 31, 2019 | $ 0 |  |  |  |
Stockholders' equity (deficit), beginning of period (in shares) at Dec. 31, 2018 |  | 24,450,757 |  |  |
Stockholders' equity (deficit), beginning of period at Dec. 31, 2018 | 90,192 | $ 3 | 246,927 | 439 | (157,177)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock upon exercise of stock options, net of shares withheld (in shares) |  | 46,809 |  |  |
Issuance of common stock upon exercise of stock options, net of shares withheld | 125 |  | 125 |  |
Stock-based compensation | 1,871 |  | 1,871 |  |
Vesting of early exercised stock options | 66 |  | 66 |  |
Additional accrual of IPO related cost | (160) |  | (160) |  |
Foreign currency translation | (19) |  |  | (19) |
Unrealized gain on marketable securities | 25 |  |  | 25 |
Net loss | (9,345) |  |  |  | (9,345)
Stockholders' equity (deficit), ending of period (in shares) at Mar. 31, 2019 |  | 24,497,566 |  |  |
Stockholders' equity (deficit), ending of period at Mar. 31, 2019 | $ 82,755 | $ 3 | 248,829 | 445 | (166,522)
Temporary equity shares outstanding, beginning of period (shares) at Dec. 31, 2018 | 0 |  |  |  |
Temporary equity, beginning of period at Dec. 31, 2018 | $ 0 |  |  |  |
Temporary equity shares outstanding, end of period (shares) at Jun. 30, 2019 | 0 |  |  |  |
Temporary equity, end of period at Jun. 30, 2019 | $ 0 |  |  |  |
Stockholders' equity (deficit), beginning of period (in shares) at Dec. 31, 2018 |  | 24,450,757 |  |  |
Stockholders' equity (deficit), beginning of period at Dec. 31, 2018 | $ 90,192 | $ 3 | 246,927 | 439 | (157,177)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock upon exercise of stock options, net of shares withheld (in shares) | 184,130 |  |  |  |
Foreign currency translation | $ (7) |  |  |  |
Unrealized gain on marketable securities | 84 |  |  |  |
Net loss | (17,999) |  |  |  |
Stockholders' equity (deficit), ending of period (in shares) at Jun. 30, 2019 |  | 24,761,157 |  |  |
Stockholders' equity (deficit), ending of period at Jun. 30, 2019 | $ 77,747 | $ 3 | 252,404 | 516 | (175,176)
Temporary equity shares outstanding, beginning of period (shares) at Mar. 31, 2019 | 0 |  |  |  |
Temporary equity, beginning of period at Mar. 31, 2019 | $ 0 |  |  |  |
Temporary equity shares outstanding, end of period (shares) at Jun. 30, 2019 | 0 |  |  |  |
Temporary equity, end of period at Jun. 30, 2019 | $ 0 |  |  |  |
Stockholders' equity (deficit), beginning of period (in shares) at Mar. 31, 2019 |  | 24,497,566 |  |  |
Stockholders' equity (deficit), beginning of period at Mar. 31, 2019 | 82,755 | $ 3 | 248,829 | 445 | (166,522)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock upon exercise of stock options, net of shares withheld (in shares) |  | 137,185 |  |  |
Issuance of common stock upon exercise of stock options, net of shares withheld | 442 |  | 442 |  |
Issuance of common stock related to employee stock purchase plan (in shares) |  | 99,086 |  |  |
Issuance of common stock related to employee stock purchase plan | 1,263 |  | 1,263 |  |
Issuance of common stock upon vesting of restricted stock units (in shares) |  | 27,320 |  |  |
Issuance of common stock upon vesting of restricted stock units | 0 |  |  |  |
Stock-based compensation | 1,814 |  | 1,814 |  |
Vesting of early exercised stock options | 56 |  | 56 |  |
Foreign currency translation | 12 |  |  | 12 |
Unrealized gain on marketable securities | 59 |  |  | 59 |
Net loss | (8,654) |  |  |  | (8,654)
Stockholders' equity (deficit), ending of period (in shares) at Jun. 30, 2019 |  | 24,761,157 |  |  |
Stockholders' equity (deficit), ending of period at Jun. 30, 2019 | $ 77,747 | $ 3 | $ 252,404 | $ 516 | $ (175,176)

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant