Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 116,797	$ 149,117
Restricted cash, current	579	638
Investment in non-marketable debt security	0	1,000
Financial assets:
Accounts receivable	24,953	13,894
Contract assets ($0 and $450 from a related party)	4,557	4,526
Unbilled receivables	8,558	10,942
Total financial assets	38,068	29,362
Less: allowances	(416)	(74)
Total financial assets, net	37,652	29,288
Inventories	1,160	964
Prepaid expenses and other current assets	5,700	3,416
Total current assets	161,888	184,423
Restricted cash	1,519	1,062
Investment in non-marketable equity securities ($12,713 and $1,450 with a related party)	14,002	1,450
Right-of-use assets - Operating leases, net	44,095	21,382
Right-of-use assets - Finance leases, net	17	119
Property and equipment, net	21,345	9,675
Goodwill	3,241	3,241
Other non-current assets	276	294
Total assets	246,383	221,646
Current liabilities:
Accounts payable	2,995	2,970
Accrued compensation	11,119	7,288
Other accrued liabilities	12,578	10,272
Current portion of lease obligations - Operating leases	4,093	2,627
Deferred revenue ($245 and $0 to a related party)	2,586	1,824
Total current liabilities	33,371	24,981
Deferred revenue, net of current portion	3,749	2,967
Long-term lease obligations, Operating leases	43,561	22,324
Other long-term liabilities	1,311	1,271
Total liabilities	81,992	51,543
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.0001 par value per share; 5,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.0001 par value per share; 100,000 shares authorized; 65,109 and 64,283 shares issued and outstanding at December 31, 2021 and December 31, 2020, respectively	6	6
Additional paid-in capital	552,083	536,516
Accumulated deficit	(387,698)	(366,419)
Total stockholders’ equity	164,391	170,103
Total liabilities and stockholders’ equity	$ 246,383	$ 221,646