CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	[1]
Current assets:
Cash and cash equivalents	$ 13,946	$ 14,280
Restricted cash	431	540
Accounts receivable, net	4,378	5,063
Prepaid expenses and other current assets	2,244	3,039
Total current assets	20,999	22,922
Property and equipment, net	4,441	5,477
Right-of-use assets, operating leases	4,145	7,737
Other non-current assets	690	873
Total assets	30,275	37,009
Current liabilities:
Accounts payable	600	928
Accrued expenses and other current liabilities	5,346	6,552
Note payable, current	1,854	1,854
Operating lease liabilities	4,505	6,800
Total current liabilities	12,305	16,134
Note payable, net of current	1,466	1,466
Operating lease liabilities, non-current	265	1,814
Other long-term liabilities	1,562	1,780
Total liabilities	15,598	21,194
Commitments and contingencies (Note 13)
Stockholders’ equity:
Common stock, $0.001 par value - 142,857 shares authorized, 11,147 and 9,743 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	11	10
Additional paid-in capital	311,675	308,065
Accumulated deficit	(295,876)	(291,163)
Accumulated other comprehensive loss	(1,133)	(1,097)
Total stockholders’ equity	14,677	15,815
Total liabilities and stockholders’ equity	$ 30,275	$ 37,009

[1] Derived from the Company’s audited consolidated financial statements as of December 31, 2020.