Supplemental Disclosure of Cash Flow and Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends Payable [Line Items]
Cash paid for interest	$ 7,456	$ 4,331	$ 197
Income taxes paid	208	308	859
Cash paid for operating leases	1,569	1,650	0
Non-cash activities:
Purchases of equipment included in accounts payable	1,062	1,184	1,168
Deferred financing costs	53	6,650	0
Deemed dividends on convertible preferred stock Series B	32,028
Amendment fee on BT Term Loan	722	0	0
Lease right of use asset and liability	1,169	0	0
Fair value of non-cash consideration received for option exercise	922	0	0
Convertible preferred stock Series B
Non-cash activities:
Deemed dividends on convertible preferred stock Series B	$ 32,028	$ 0	$ 0