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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Instruments (Details) - Level 3 - Warrant Liability $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Balance | $ 683
Change in fair value | 1,403
Reclassification of warrant liability to additional paid-in capital on conversion | (2,086)
Balance | $ 0

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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
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