Fair Value Measurements - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 26, 2017
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	$ 17
Impact of 10% change in the estimate of fair value of the common stock	$ 24
Warrant Liability | Common Stock | Expected term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability, measurement input, term	6 months	2 years
Warrant Liability | Common Stock | Risk-free interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Common stock warrant liability, measurement input	0.001	0.0153
Warrant Liability | Common Stock | Expected volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Common stock warrant liability, measurement input	0.8897	0.7897
Warrant Liability | Common Stock | Expected dividend yield
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Common stock warrant liability, measurement input	0	0