Commitments and Contingencies - Narrative (Details)	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 ft²	Nov. 30, 2017 ft²	Aug. 31, 2014 ft²
Loss Contingencies [Line Items]
Right-of-use assets obtained in exchange for operating lease liabilities	$ 3,000,000	$ 0
Right-of-use asset	7,000,000		$ 4,200,000
Cash paid for operating lease liabilities	300,000	200,000
Amortization of the ROU asset	$ 200,000	100,000
Weighted-average remaining lease terms for operating leases	7 years 7 months		7 years 10 months
Weighted-average discount rate on operating leases (as a percent)	6.90%		7.25%
Period after first sale royalty is due	12 years
Net revenue due as royalty (as a percent)	4.00%
Revenues	$ 26,296,000	1,077,000
Royalty expense	1,000,000	$ 0
Maximum
Loss Contingencies [Line Items]
Royalty commitments	$ 200,000
First Lease
Loss Contingencies [Line Items]
Term of operating lease contract						5 years
Net rentable area (square feet) | ft²						12,215
Second Lease
Loss Contingencies [Line Items]
Term of operating lease contract					7 years
Net rentable area (square feet) | ft²					25,548
Renewal term of operating lease					5 years
Third Lease
Loss Contingencies [Line Items]
Term of operating lease contract				8 years
Net rentable area (square feet) | ft²				32,621
Renewal term of operating lease				5 years