CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash, cash equivalents and restricted cash	$ 53,992	$ 35,937
Marketable securities	25,013	39,078
Accounts receivable, net	933	704
Prepaid expenses and other current assets	2,776	3,118
Discontinued operations - current assets		4,966
Total current assets	82,714	83,803
Property and equipment, net	2,187	2,470
Intangible assets	7,180	7,199
Other assets	4,731	4,825
Total assets	96,812	98,297
Current liabilities:
Accounts payable	6,946	9,917
Accrued expenses	10,374	7,721
Current portion of lease liabilities	624	637
Discontinued operations - current liabilities	2,659	4,157
Total current liabilities	20,603	22,432
Other liabilities	3,477	3,736
Long-term debt, net	10,573
Contingent consideration	3,435	1,668
Deferred tax liability	549	549
Total liabilities	38,637	28,385
Stockholders' Equity:
Preferred stock, $0.00001 par value; 10,000,000 shares authorized and no shares issued or outstanding at March 31, 2020 and December 31, 2019
Common stock, $0.00001 par value; 100,000,000 shares authorized at March 31, 2020 and December 31, 2019; 41,832,220 and 41,485,638 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively
Additional paid-in capital	527,241	523,505
Accumulated other comprehensive income (loss)	47	(66)
Accumulated deficit	(469,113)	(453,527)
Total stockholders’ equity	58,175	69,912
Total liabilities and stockholders’ equity	$ 96,812	$ 98,297