CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 38,696	$ 46,582
Short term investments	6,000	5,750
Accounts receivable, net	31,001	26,672
Inventory, net	4,248	5,133
Prepaid expenses and other current assets	2,341	1,540
Total current assets	82,286	85,677
Investments	2,500	3,250
Property and equipment, net of accumulated depreciation	6,440	5,447
Goodwill	4,040	4,040
Intangible assets, net of accumulated amortization	10,813	10,845
Other assets	26	0
Total assets	106,105	109,259
Current liabilities:
Accounts payable	5,379	3,661
Accrued compensation	8,720	11,523
Accrued expenses	3,615	2,504
Other current liabilities	746	716
Total current liabilities	18,460	18,404
Other liabilities	1,244	1,526
Total liabilities	19,704	19,930
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred stock; $.001 par value; 5,000,000 shares authorized and 0 shares issued and outstanding	0	0
Common stock; $.001 par value; 130,000,000 shares authorized; 109,468,759 issued and 108,491,478 outstanding at March 31, 2015 and 108,776,247 issued and 107,789,611 outstanding at December 31, 2014	109	108
Additional paid-in capital	158,401	162,433
Treasury stock at cost: 977,281 shares at March 31, 2015 and 986,636 shares at December 31, 2014	(8,621)	(5,637)
Accumulated deficit	(63,488)	(67,575)
Total stockholders' equity	86,401	89,329
Total liabilities and stockholders' equity	$ 106,105	$ 109,259