CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 3,708,000	$ 12,269,000
Accounts receivable	310,000	238,000
Due from related party	28,000	146,000
Unbilled receivables	103,000	150,000
Inventory	396,000	379,000
Prepaid expenses and other current assets	622,000	1,668,000
Short-term restricted cash	494,000	494,000
Total current assets	5,661,000	15,344,000
Restricted cash	432,000	125,000
Property and equipment, net	2,577,000	905,000
Other assets	717,000	714,000
Total assets	9,387,000	17,088,000
Current Liabilities:
Accounts payable	1,467,000	120,000
Accrued expenses	1,701,000	3,513,000
Deferred revenue	882,000	277,000
Total current liabilities	4,050,000	3,910,000
Other long-term liabilities	1,195,000	150,000
Total liabilities	5,245,000	4,060,000
Commitments and contingencies (Note 9)
Stockholders’ Equity:
Preferred stock ($0.01 par value per share); 5,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock ($0.01 par value per share); 250,000,000 shares authorized at June 30, 2016 and December 31, 2015; 27,752,176 and 27,331,435 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	278,000	273,000
Additional paid-in capital	339,391,000	338,580,000
Accumulated other comprehensive loss	(78,000)	(72,000)
Accumulated deficit	(335,449,000)	(325,753,000)
Total stockholders’ equity	4,142,000	13,028,000
Total liabilities and stockholders’ equity	9,387,000	17,088,000
Cash, Cash Equivalents, and Short-term Investments	$ 3,708,000	$ 12,269,000