Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 16,580	$ 20,079
Marketable securities		51,199
Restricted cash		584
Prepaid expenses and other current assets	2,112	4,240
Total current assets	18,692	76,102
Property and equipment, net		2,269
Equity method investment		7,428
Other assets	1,390	2,744
Total assets	20,082	88,543
Current liabilities:
Accounts payable, accrued expenses and other	2,714	13,677
Deferred rent		1,118
Other current liability	56
Total current liabilities	2,770	14,795
Note payable, net of discount		14,873
Other long-term liabilities		56
Total liabilities	2,770	29,724
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at December 31, 2019 and 2018; no shares issued or outstanding at December 31, 2019 or 2018
Common stock, $0.01 par value: 30,000 shares authorized at December 31, 2019 and 2018; 13,380 and 13,343 shares issued and outstanding at December 31, 2019 and 2018, respectively	1,334	1,334
Additional paid-in capital	556,587	580,771
Accumulated other comprehensive loss		(9)
Accumulated deficit	(540,609)	(523,277)
Total stockholders’ equity	17,312	58,819
Total liabilities and stockholders’ equity	$ 20,082	$ 88,543