Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 38,722	$ 44,711
Inventory, net	0	27
Prepaid interest, current portion	1,710	0
Prepaid expenses and other current assets	362	821
Total current assets	40,794	45,559
Property and equipment, net	1,039	1,637
Restricted cash	225	225
Prepaid interest, non-current portion	2,319	0
Other assets	0	78
Total Assets	44,377	47,499
Current Liabilities:
Accounts payable	3,263	350
Accrued expenses	7,582	6,116
Deferred revenue	0	43
Common stock warrant liability	223	1,258
Equipment loans, current portion	0	62
Total current liabilities	11,068	7,829
Long-term Debt:
Long term debt, gross	25,000	30,000
Discount on long-term debt	0	(9,698)
Long-term debt, net	25,000	20,302
Other liabilities	43	169
Total liabilities	36,111	28,300
Stockholders' Equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.001 par value; 36,000,000 shares authorized; 8,196,011 and 6,114,843 shares issued at December 31, 2015 and 2014, respectively; 8,194,519 and 6,113,351 shares outstanding at December 31, 2015 and 2014, respectively	8	6
Additional paid-in capital	590,490	546,255
Accumulated deficit	(579,178)	(524,008)
Treasury stock (at cost); 1,492 shares	(3,054)	(3,054)
Total stockholders' equity	8,266	19,199
Total liabilities & stockholders' equity	$ 44,377	$ 47,499