Fair Value Measurements - Recurring Basis (Details)				12 Months Ended
	Nov. 26, 2018 $ / shares shares	Dec. 11, 2017 $ / shares shares	Dec. 04, 2017 USD ($) $ / shares shares	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 27, 2018 $ / shares	Dec. 31, 2016 $ / shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued | shares				58,334	15,750	1,890,602
Share Price						$ 5.325	$ 3.00
Exercise price of warrants (in dollars per share)				$ 7.21	$ 6.35	$ 5.21		$ 3.06
Common warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued | shares	15,750	1,783,587	1,783,587
Fair value | $			$ 2,064,000			$ 2,683,000
Share Price			$ 5.00			$ 5.60
Exercise price of warrants (in dollars per share)	$ 3.06	$ 5.25	$ 5.25
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			1.66			1.76
Warrant measurement input			1.66			1.76
Common warrants | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and Rights Outstanding, Measurement Input			61			62
Warrant measurement input			61			62
Placement agent warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued | shares		107,015	107,015
Fair value | $			$ 81,000			$ 108,000
Share Price			$ 5.00			$ 5.60
Exercise price of warrants (in dollars per share)		$ 6.6562	$ 6.6562
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			1.66			1.76
Warrant measurement input			1.66			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			61			62
Warrant measurement input			61			62