Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 6,157	$ 22,723
Short-term investments	17,831	31,857
Accounts receivable, net	12,547	10,806
Inventories, net	10,919	9,305
Deferred tax asset, net	3,848	3,690
Prepaid expenses and other current assets	2,121	2,077
Total current assets	53,423	80,458
Long-term investments	10,821	10,635
Property and equipment, net	16,183	13,868
Other assets	206	212
Total assets	80,633	105,173
Current liabilities:
Accounts payable	6,059	9,236
Accrued expenses and other current liabilities	9,510	8,699
Total current liabilities	15,569	17,935
Long-term liabilities:	2,194	978
Total liabilities	$ 17,763	$ 18,913
Commitments and contingencies (Note 10)
Stockholders' equity:
Preferred stock, par value $0.001: 5,000,000 shares authorized; no shares issued and outstanding at December 31, 2015 and 2014, respectively
Common stock, par value $0.001: 100,000,000 shares authorized; 15,786,785 and 17,942,595 shares issued and outstanding at December 31, 2015 and 2014, respectively	$ 16	$ 18
Additional paid-in-capital	76,462	111,622
Accumulated deficit	(13,779)	(26,817)
Accumulated other comprehensive income	171	1,437
Total stockholders' equity	62,870	86,260
Total liabilities and stockholders' equity	$ 80,633	$ 105,173