Consolidated Statement of Operations - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Subscription and support	$ 14,719	$ 14,129	$ 14,023	$ 14,322	$ 12,715	$ 12,368	$ 11,805	$ 11,737	$ 57,193	$ 48,625	$ 30,887
Perpetual license	608	540	846	811	840	850	657	440	2,805	2,787	2,003
Total product revenue	15,327	14,669	14,869	15,133	13,555	13,218	12,462	12,177	59,998	51,412	32,890
Professional services	2,273	2,436	2,809	2,395	2,920	3,057	3,749	3,436	9,913	13,162	8,303
Total revenue	17,600	17,105	17,678	17,528	16,475	16,275	16,211	15,613	69,911	64,574	41,193
Cost of revenue:
Subscription and support	5,242	4,771	4,841	4,732	3,950	3,488	3,346	3,258	19,586	14,042	7,787
Professional services	1,768	1,677	1,732	1,908	2,037	2,305	2,340	2,397	7,085	9,079	5,680
Total cost of revenue	7,010	6,448	6,573	6,640	5,987	5,793	5,686	5,655	26,671	23,121	13,467
Gross profit	10,590	10,657	11,105	10,888	10,488	10,482	10,525	9,958	43,240	41,453	27,726
Operating expenses:
Sales and marketing	3,058	2,929	3,446	3,532	3,752	3,767	4,015	3,136	12,965	14,670	10,625
Research and development	3,848	3,852	4,152	3,926	3,979	3,793	3,494	14,899	15,778	26,165	10,340
Refundable Canadian tax credits	(112)	(115)	(122)	(121)	(682)	(138)	(138)	(136)	(470)	(1,094)	(583)
General and administrative	3,874	4,494	4,714	5,119	4,330	3,555	3,053	2,623	18,201	13,561	6,832
Depreciation and amortization	1,327	1,130	1,063	1,014	1,122	1,067	1,066	1,055	4,534	4,310	3,670
Acquisition-related expenses	1,374	176	360	545	1,557	108	231	290	2,455	2,186	1,461
Total operating expenses	13,369	12,466	13,613	14,015	14,058	12,152	11,721	21,867	53,463	59,798	32,345
Loss from operations	(2,779)	(1,809)	(2,508)	(3,127)	(3,570)	(1,670)	(1,196)	(11,909)	(10,223)	(18,345)	(4,619)
Other expense:
Interest expense, net	(473)	(462)	(576)	(347)	(720)	(397)	(419)	(415)	(1,858)	(1,951)	(2,797)
Other income (expense), net	(157)	137	(12)	(512)	409	60	(482)	114	(544)	101	(431)
Total other expense	(630)	(325)	(588)	(859)	(311)	(337)	(901)	(301)	(2,402)	(1,850)	(3,228)
Loss before provision for income taxes	(3,409)	(2,134)	(3,096)	(3,986)	(3,881)	(2,007)	(2,097)	(12,210)	(12,625)	(20,195)	(7,847)
Provision for income taxes	(854)	(190)	(238)	243	1,206	(438)	(280)	(410)	(1,039)	78	(708)
Loss from continuing operations	(4,263)	(2,324)	(3,334)	(3,743)	(2,675)	(2,445)	(2,377)	(12,620)	(13,664)	(20,117)	(8,555)
Income (loss) from discontinued operations, net of tax of $0, $0, and $642 for 2015, 2014, and 2013, respectively	0	0	0	0	0	0	0	0	0	0	(642)
Net loss	(4,263)	(2,324)	(3,334)	(3,743)	(2,675)	(2,445)	(2,377)	(12,620)	(13,664)	(20,117)	(9,197)
Preferred stock dividends and accretion	0	0	0	0	(204)	(445)	(440)	(435)	0	(1,524)	(98)
Net loss attributable to common shareholders	$ (4,263)	$ (2,324)	$ (3,334)	$ (3,743)	$ (2,879)	$ (2,890)	$ (2,817)	$ (13,055)	$ (13,664)	$ (21,641)	$ (9,295)
Net loss per common share:
Loss from continuing operations per common share, basic and diluted (in USD per share)									$ (0.91)	$ (4.43)	$ (7.23)
Income (loss) from discontinued operations per common share, basic and diluted (in USD per share)									0.00	0.00	(0.54)
Net loss per common share, basic and diluted (in USD per share)	$ (0.28)	$ (0.16)	$ (0.22)	$ (0.25)	$ (0.30)	$ (0.80)	$ (0.80)	$ (4.48)	$ (0.91)	$ (4.43)	$ (7.77)
Weighted-average common shares outstanding, basic and diluted									14,939,601	4,889,901	1,196,668