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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Product revenues:      
Related party $ 0 $ 0 $ 1,845,000
Third party 4,838,000 4,953,000 5,277,000
Total product revenues 4,838,000 4,953,000 7,122,000
Cost of product revenues 3,186,000 2,940,000 3,421,000
Gross profit 1,652,000 2,013,000 3,701,000
Development revenues:      
Development, related party 0 0 638,000
Development 0 0 1,179,000
Government contracts and other 6,821,000 2,645,000 3,257,000
Total development revenues 6,821,000 2,645,000 5,074,000
Operating expenses:      
Research and development 19,000,000 15,105,000 17,065,000
Sales and marketing 2,662,000 6,406,000 9,026,000
General and administrative 9,765,000 15,953,000 16,031,000
Change in fair value of warrants (7,668,000) (369,000) (418,000)
Change in fair value of option liability 0 0 (2,250,000)
Total operating expenses 23,759,000 37,095,000 39,454,000
Operating loss (15,286,000) (32,437,000) (30,679,000)
Other income (expense):      
Gain (loss) on asset disposal 3,000 42,000 (257,000)
Loss on debt extinguishment (260,000) 0 (708,000)
Interest income 9,000 6,000 4,000
Interest expense (3,379,000) (4,371,000) (3,396,000)
Other income (expense), net 169,000 (608,000) (438,000)
Gain on Puregraft divestiture 0 0 4,453,000
Gain on previously held equity interest in joint venture 0 0 4,892,000
Equity loss from investment in joint venture 0 0 (48,000)
Total other income (expense) (3,458,000) (4,931,000) 4,502,000
Net loss (18,744,000) (37,368,000) (26,177,000)
Beneficial conversion feature for convertible preferred stock (661,000) (1,169,000) 0
Net loss allocable to common stock holders $ (19,405,000) $ (38,537,000) $ (26,177,000)
Basic and diluted net loss per share allocable to common stockholders (in dollars per share) $ (0.14) $ (0.48) $ (0.39)
Basic and diluted weighted average shares used in calculating net loss per share allocable to common stockholders (in shares) 140,797,316 80,830,698 67,781,364
Comprehensive loss:      
Net loss $ (18,744,000) $ (37,368,000) $ (26,177,000)
Other comprehensive income - foreign currency translation adjustments 296,000 444,000 256,000
Comprehensive loss $ (18,448,000) $ (36,924,000) $ (25,921,000)