UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net revenues:        
Subscription and support revenues $ 11,983 $ 14,388 $ 38,133 $ 44,183
Embedded devices and hardware 3,320 3,024 7,535 8,886
Total net revenues 15,303 17,412 45,668 53,069
Cost of sales        
Subscription and support revenues 5,087 5,828 15,915 17,242
Embedded devices and hardware 3,458 3,082 7,748 9,027
Inventory reserves 1,301 27 1,355 514
Gross profit 5,457 8,475 20,650 26,286
Operating expenses:        
Sales and marketing 2,183 3,229 8,019 9,444
General and administrative 2,314 3,280 7,691 11,269
Engineering and development 1,341 2,229 5,260 6,920
Depreciation and amortization 1,426 1,658 4,392 4,992
Impairment of goodwill and other intangible assets       4,172
Restructuring charges 655 276 1,435 1,520
Operating loss (2,462) (2,197) (6,147) (12,031)
Interest expense 919 469 2,282 1,196
Loss on extinguishment of debt     1,089 290
Other (income) expense, net (34) (33) 767 (99)
Loss before income taxes (3,347) (2,633) (10,285) (13,418)
Income tax expense (benefit) 79 (87) 244 (257)
Net loss (3,426) (2,546) (10,529) (13,161)
Other items of comprehensive (loss) income, net of income taxes:        
Foreign currency translation adjustment   1 (6) 12
Comprehensive loss $ (3,426) $ (2,545) $ (10,535) $ (13,149)
Loss per share:        
Basic (in dollars per share) $ (0.17) $ (0.13) $ (0.54) $ (0.68)
Diluted $ (0.17) $ (0.13) $ (0.54) $ (0.68)
Weighted average shares outstanding used in per share calculation        
Basic (in shares) 19,646 19,542 19,575 19,456
Diluted (in shares) 19,646 19,542 19,575 19,456