Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues	$ 10,854	$ 6,945	$ 19,286	$ 12,408
Cost of revenues	974	1,116	1,891	2,425
Gross profit	9,880	5,829	17,395	9,983
Operating expenses:
Selling and marketing	1,768	1,447	3,735	3,177
Research and development	2,743	2,195	5,425	4,450
General and administrative	2,426	2,061	5,126	4,251
Restructuring expense	11	52	115	52
Total operating expenses	6,948	5,755	14,401	11,930
Operating income (loss)	2,932	74	2,994	(1,947)
Other income (expense):
Interest income (expense), net	31	(143)	30	(314)
Change in fair value of warrant liability		(2,085)		(2,224)
Gain on sale of software product	483		483
Other expense	(6)	(10)	(15)	(50)
Income (loss) before provision for income taxes	3,440	(2,164)	3,492	(4,535)
Provision for income tax expense	4	13	8	23
Net income (loss)	$ 3,436	$ (2,177)	$ 3,484	$ (4,558)
Net earnings (loss) per share:
Basic	$ 0.11	$ (0.11)	$ 0.11	$ (0.26)
Diluted	$ 0.10	$ (0.11)	$ 0.10	$ (0.26)
Weighted average shares outstanding:
Basic	32,068	21,888	31,685	18,612
Diluted	35,308	21,888	33,365	18,612
Preferred dividends per share	$ 25.01	$ 50.38	$ 50.01	$ 71.16