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Fair Value Measurements - Fair value measurement (Details) - Recurring - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Warrants
Liabilities:
Redeemable convertible preferred stock warrant liabilities		$ 1,503
Level 1 | Warrants
Liabilities:
Redeemable convertible preferred stock warrant liabilities		0
Level 2 | Warrants
Liabilities:
Redeemable convertible preferred stock warrant liabilities		0
Level 3 | Warrants
Liabilities:
Redeemable convertible preferred stock warrant liabilities		1,503
Money market funds
Assets:
Money market funds	$ 71,950	8,618
Money market funds | Level 1
Assets:
Money market funds	71,950	8,618
Money market funds | Level 2
Assets:
Money market funds	0	0
Money market funds | Level 3
Assets:
Money market funds	$ 0	$ 0

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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