CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 32,587	$ 35,937
Marketable securities	35,528	39,078
Accounts receivable, net	775	704
Prepaid expenses and other current assets	2,065	3,118
Discontinued operations - current assets		4,966
Total current assets	70,955	83,803
Property and equipment, net	2,230	2,470
Intangible assets	7,161	7,199
Other assets	4,653	4,825
Total assets	84,999	98,297
Current liabilities:
Accounts payable	5,502	9,917
Accrued expenses	9,344	7,721
Current portion of lease liabilities	610	637
Discontinued operations - current liabilities	2,289	4,157
Total current liabilities	17,745	22,432
Other liabilities	3,331	3,736
Long-term debt, net	10,573
Contingent consideration	3,435	1,668
Deferred tax liability	549	549
Total liabilities	35,633	28,385
Stockholders' Equity:
Preferred stock, $0.00001 par value; 10,000,000 shares authorized and no shares issued or outstanding at June 30, 2020 and December 31, 2019
Common stock, $0.00001 par value; 100,000,000 shares authorized at June 30, 2020 and December 31, 2019; 42,691,114 and 41,485,638 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively
Additional paidin capital	530,061	523,505
Accumulated other comprehensive income (loss)	15	(66)
Accumulated deficit	(480,710)	(453,527)
Total stockholders' equity	49,366	69,912
Total liabilities and stockholders' equity	$ 84,999	$ 98,297