Summary of Significant Accounting Policies - Leases (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases liabilities, current portion	$ 228,000	$ 337,000
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Monthly base rents	38,000
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Monthly base rents	$ 41,000
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease - right-of-use asset			$ 1,111
Operating leases liabilities, current portion			337
Operating leases liabilities, long term			395
Deferred rent				$ 380
Adoption Impact | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease - right-of-use asset			1,111
Operating leases liabilities, current portion			337
Operating leases liabilities, long term			395
Deferred rent			$ (380)