Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 36,707	$ 68,795
Short-term marketable securities	57,424	39,477
Accounts receivable, net of allowance for doubtful accounts of $757 and $442 as of December 31, 2017 and December 31, 2016, respectively	51,503	34,060
Inventory	11,271	9,310
Prepaid expenses and other current assets	6,267	5,697
Income taxes receivable	1,832	445
Total current assets	165,004	157,784
Property and equipment, net	166,440	139,474
Goodwill	128,504	28,916
Other intangible assets, net	19,084	2,655
Long-term marketable securities	37,034	84,479
Other long-term assets	2,672	933
Total assets	518,738	414,241
Liabilities and shareholders' equity
Accounts payable	15,876	11,322
Accrued compensation	12,100	7,670
Accrued liabilities and other	8,408	4,435
Short-term debt obligations	5,000
Income taxes payable	2,371
Total current liabilities	43,755	23,427
Long-term income taxes payable	2,181
Long-term deferred tax liabilities	6,966	7,003
Other long-term liabilities	4,621	3,978
Total liabilities	57,523	34,408
Shareholders' equity
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of December 31, 2017 and December 31, 2016, respectively
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 26,828,651 and 26,504,868 shares as of December 31, 2017 and December 31, 2016, respectively	27	26
Additional paid-in capital	241,725	213,857
Retained earnings	224,697	176,703
Accumulated other comprehensive loss	(5,234)	(10,753)
Total shareholders' equity	461,215	379,833
Total liabilities and shareholders' equity	$ 518,738	$ 414,241

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.