Supplemental Disclosure of Noncash Investing and Financing Activities - Supplemental Disclosure of Noncash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investing activities:
Acquisition-related contingent consideration	$ 514	$ 542	$ 4,809
Common stock issued in connection with the acquisition			2,243
Capital expenditures incurred not yet paid	835	3,874	9,081
Capital expenditure milestone payable incurred not yet paid	4,609
Stock-based compensation included in capital expenditures	314	195	307
Unpaid debt issuance costs included in accrued liabilities			734
Unpaid share issuance cost included in accrued liabilities			60
Capitalized interest expense included in accrued liabilities		894	1,389
Financing activities:
Common stock issued as form of payment for MPUs		358	213
Common stock issued as payment for contingent consideration	352
Series A convertible preferred stock dividend paid in kind	$ 14	$ 36	$ 37