Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 38,395	$ 11,880
Trade accounts receivable, net of allowance for doubtful accounts of $63 in 2014 and $73 in 2013	7,548	7,623
Inventory, net	1,965	1,891
Prepaid expenses and other current assets	639	649
Total current assets	48,547	22,043
Property and equipment, net of accumulated depreciation and amortization of $3,819 in 2014 and $4,265 in 2013	1,664	1,671
Other assets	350	419
Intangible assets, net of accumulated amortization of $12,841 in 2014 and $12,468 in 2013	13,316	13,674
Goodwill	21,109	21,109
Total assets	84,986	58,916
Current liabilities:
Accounts payable	1,201	2,000
Accrued and other expenses	3,365	3,799
Interest payable	578	483
Notes and lease payable - current portion	3,882	3,878
Warrant liability	2,850	3,986
Deferred revenue	8,403	8,306
Total current liabilities	20,279	22,452
Deferred revenue, long-term portion	1,509	1,726
Other long-term liabilities	1,154	1,356
Capital lease - long-term portion	198	235
Notes payable - long-term portion	11,905	11,770
Total liabilities	35,045	37,539
Commitments and Contingencies (Note 6)
Stockholders' equity:
Preferred stock, $ .01 par value: authorized 1,000,000 shares; none issued.
Common stock, $ .01 par value: authorized 20,000,000 shares; issued 13,958,183 in 2014 and 11,084,119 in 2013; outstanding 13,772,352 in 2014 and 10,898,288 in 2013	140	111
Additional paid-in capital	195,460	166,735
Accumulated deficit	(144,244)	(144,054)
Treasury stock at cost, 185,831 shares in 2014 and 2013	(1,415)	(1,415)
Total stockholders' equity	49,941	21,377
Total liabilities and stockholders' equity	$ 84,986	$ 58,916