1. Summary of Significant Accounting Policies (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Warrants outstanding, shares	2,000,000		2,000,000
Stock based compensation costs	$ 1,300	$ 1,200	$ 2,622	$ 2,595
Unrecognized stock-based compensation costs	9,000		$ 9,000
Unrecognized stock-based compensation costs amortization period			2 years 2 months 12 days
Aggregate intrinsic value outstanding	13,400		$ 13,400
Aggregate intrinsic value exercisable	$ 11,600		$ 11,600
Options exercised, shares			429,300	29,200
Total intrinsic value of options exercised			$ 1,300	$ 91
Shares available for future grants	2,400,000		2,400,000
Repurchase of common stock, shares repurchased			1,600,000	0
Repurchase of common stock average share price			$ 4.06
Proceeds from exercise of options			$ 738	$ 48
Options [Member]
Proceeds from exercise of options			$ 149
Surrender of option shares			30,149
Common Stock [Member]
Repurchase of common stock, shares repurchased			1,100,000
Repurchase of common stock average share price			$ 4.75
Common Stock [Member] | Open market [Member]
Repurchase of common stock, shares repurchased			1,102,410
Repurchase of common stock average share price			$ 4.74
Common Stock [Member] | Net exercises of outstanding options [Member]
Repurchase of common stock, shares repurchased			30,149