Commitments and Contingencies (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) $ / ft²	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / ft²	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Commitments and Contingencies [Abstract]
Lease term	15 years		15 years
Base rent per square foot (in dollars per square foot) | $ / ft²	18		18
Base rental			$ 1,100
Accumulated amortization on the leased property	$ 5,400		5,400		$ 5,200
Lease Cost [Abstract]
Finance lease cost - interest expense	264	$ 268	800	$ 810
Finance lease cost - amortization of right-of-use asset	66	67	200	200
Operating lease cost	104	172	284	551
Sublease income	(46)	(121)	(138)	(364)
Total lease cost	388	386	1,146	1,197
Cash paid for amounts included in the measurement of lease liabilities [Abstract]
Operating cash flows from finance lease	0	0	0	0
Operating cash flows from operating leases	87	177	240	602
Financing cash flows from finance lease	56	46	160	132
Total cash paid for amounts included in the measurement of lease liabilities	143	223	400	734
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 0	$ 324	$ 1,431
Weighted average remaining lease term-finance lease	8 years 3 months 18 days	9 years 3 months 18 days	8 years 3 months 18 days	9 years 3 months 18 days
Weighted average remaining lease term-operating leases	2 years 2 months 12 days	2 years 9 months 18 days	2 years 2 months 12 days	2 years 9 months 18 days
Weighted average discount rate-finance lease	19.10%	19.10%	19.10%	19.10%
Weighted average discount rate-operating leases	5.00%	5.00%	5.00%	5.00%
Finance lease right-of-use asset, net of amortization	$ 1,700		$ 1,700		1,900
Operating right-of-use assets, net of amortization	900		900		$ 800
Finance Leases [Abstract]
2020 (excluding the nine months ended June 30, 2020)	319		319
2021	1,080		1,080
2022	1,080		1,080
2023	1,080		1,080
2024	1,080		1,080
Thereafter	4,320		4,320
Total lease payments	8,959		8,959
Less imputed interest	(4,509)		(4,509)
Total lease payments	4,450		4,450
Operating Leases [Abstract]
2020 (excluding the six months ended June 30, 2020)	103		103
2021	346		346
2022	279		279
2023	184		184
2024	61		61
Thereafter	0		0
Total lease payments	973		973
Less imputed interest	(73)		(73)
Total lease liabilities	900		900
Total Leases [Abstract]
2020 (excluding the six months ended June 30, 2020)	422		422
2021	1,426		1,426
2022	1,359		1,359
2023	1,264		1,264
2024	1,141		1,141
Thereafter	4,320		4,320
Total lease payments	9,932		9,932
Less imputed interest	(4,582)		(4,582)
Total lease liabilities	5,350		5,350
Minimum future sublease rental, due from affiliated entities	700		$ 700
Period of minimum future sublease rental, due from affiliated entities			4 years
Future sublease payments from AC per month	$ 15		$ 15