Fair Value Measurements - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)	Feb. 17, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impact of 10% change in estimate of expected volatility of the fair value of the common stock	$ 33
Impact of 10% change in the estimate of fair value of the common stock	$ 59
Warrant Liability | Preferred Stock | Expected term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability, measurement input, term		2 years
Warrant Liability | Preferred Stock | Risk-free interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Common stock warrant liability, measurement input		0.0153
Warrant Liability | Preferred Stock | Expected volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Common stock warrant liability, measurement input		0.7897
Warrant Liability | Preferred Stock | Expected dividend yield
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Common stock warrant liability, measurement input		0