Summary of Significant Accounting Policies - Fair Value Measurements and Derivative Liability (Details) - 2026 Convertible Notes - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 01, 2019
Summary of Significant Accounting Policies
Convertible notes issued	$ 37,500	$ 37,500
Convertible notes at amortized cost	26,352
Estimated fair value	$ 58,222

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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