Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 47,653,000	$ 43,329,000
Short-term marketable securities	33,201,000	30,706,000
Accounts receivable, net of allowance for doubtful accounts of $330 and $198 as of December 31, 2015 and December 31, 2014, respectively	36,125,000	24,226,000
Inventory	9,771,000	6,194,000
Prepaid expenses and other current assets	5,224,000	$ 3,406,000
Income taxes receivable	6,028,000
Total current assets	138,002,000	$ 107,861,000
Property and equipment, net	125,475,000	91,626,000
Goodwill	28,916,000	28,916,000
Other intangible assets, net	3,337,000	4,083,000
Long-term marketable securities	64,789,000	54,318,000
Other long-term assets	517,000	227,000
Total assets	361,036,000	287,031,000
Current liabilities
Accounts payable	13,643,000	7,882,000
Accrued compensation	9,993,000	6,067,000
Accrued liabilities and other	$ 2,626,000	2,718,000
Income taxes payable		1,953,000
Current portion of long-term debt obligations		139,000
Total current liabilities	$ 26,262,000	18,759,000
Long-term deferred tax liabilities	$ 4,240,000	1,363,000
Long-term debt obligations		10,000
Other long-term liabilities	$ 2,889,000	1,360,000
Total liabilities	$ 33,391,000	$ 21,492,000
Shareholders' equity
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of December 31, 2015 and December 31, 2014, respectively
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 26,200,718 and 25,838,110 shares as of December 31, 2015 and December 31, 2014, respectively	$ 26,000	$ 26,000
Additional paid-in capital	198,835,000	180,960,000
Retained earnings	133,996,000	87,482,000
Accumulated other comprehensive loss	(5,212,000)	(2,929,000)
Total shareholders' equity	327,645,000	265,539,000
Total liabilities and shareholders' equity	$ 361,036,000	$ 287,031,000