Fair Value Measurements - Additional Information (Details)	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 11, 2017 $ / shares shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exercise price of warrants (in dollars per share)	$ 80.43	$ 7.21	$ 6.35	$ 5.21
Warrant expiration date					Dec. 11, 2018
Fair value | $				$ 2,791,000
Share Price				$ 5.325
Warrant liability | $			$ 0
Financial liabilities fair value disclosure | $	$ 0	$ 0
Common warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Common stock to be issued if warrants are exercised (in shares) | shares					1,783,587
Exercise price of warrants (in dollars per share)				$ 5.25	$ 5.25
Fair value | $				$ 2,683,000
Share Price				$ 5.60
Common warrants | Risk Free Interest Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and Rights Outstanding, Measurement Input				1.76
Common warrants | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and Rights Outstanding, Measurement Input				62
Placement agent warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Common stock to be issued if warrants are exercised (in shares) | shares					107,015
Exercise price of warrants (in dollars per share)					$ 6.6562
Warrant expiration date					Dec. 11, 2018
Fair value | $				$ 108,000
Share Price				$ 5.60
Placement agent warrants | Risk Free Interest Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and Rights Outstanding, Measurement Input				1.76
Placement agent warrants | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and Rights Outstanding, Measurement Input				62