Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 20,810	$ 31,346
Accounts receivable, net of allowance for doubtful accounts of $25 and $25, respectively	72	62
Inventory, net	621	477
Prepaid expenses and other current assets	734	1,271
Total current assets	22,237	33,156
Property and equipment, net of accumulated depreciation of $615 and $434, respectively	1,599	1,658
Intangible assets and other assets, net	5,514	5,789
Total assets	29,350	40,603
Current liabilities:
Accounts payable	1,142	921
Accrued expenses	420	494
Deferred revenue	150	139
Total current liabilities	1,712	1,554
Warrant liability	653	374
Other long-term liabilities	447	344
Total liabilities	2,812	2,272
Commitments
Shareholders' equity:
Common stock, $0.001 par value; 1,100,000,000 shares authorized; 26,235,998 issued and outstanding	26	26
Common stock-subscription receivable	(2,000)	(2,004)
Additional paid-in capital	112,631	112,384
Accumulated deficit	(84,119)	(72,075)
Total shareholders' equity	26,538	38,331
Total liabilities and shareholders' equity	$ 29,350	$ 40,603