Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 27, 2012	May 05, 2010 Defendant	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Commitments And Contingencies Disclosure [Line Items]
Number of defendants		4
Agreement period not to refile claims		90 days
Probable or reasonably possible loss			$ 0		$ 0
Operating Leases, Future Minimum Payments Due			8,400,000		8,400,000
Rent expense			500,000	500,000	1,100,000	1,100,000
Liabilities, fair value							1,985,000
Year of acquisition					Oct. 12, 2011
Proceeds from issuance of common stock, net of issuance costs	39,800,000
Revenue			77,451,000	74,990,000	145,619,000	131,053,000
Penalty payment derivative			425,000		425,000		239,000
Private Placement
Commitments And Contingencies Disclosure [Line Items]
Targeted expansion completion date					Jul. 31, 2014
Extended date for achievement of Investment Obligation					Mar. 31, 2015
Private Placement | Embedded Derivative Financial Instruments
Commitments And Contingencies Disclosure [Line Items]
Other non-current liability			5,000,000		5,000,000
Private Placement | RUSSIAN FEDERATION
Commitments And Contingencies Disclosure [Line Items]
Percentage of investment obligation that must be spent inside Russia			80.00%		80.00%
Private Placement | Capital Addition Purchase Commitments
Commitments And Contingencies Disclosure [Line Items]
Other non-current liability			15,000,000		15,000,000
Private Placement | Research and Development Arrangement
Commitments And Contingencies Disclosure [Line Items]
Other current liability, cash and non-cash			15,000,000		15,000,000
Private Placement | Performance Guarantee
Commitments And Contingencies Disclosure [Line Items]
Other non-current liability			30,000,000		30,000,000
Santur Corporation
Commitments And Contingencies Disclosure [Line Items]
Amount of indemnification claims by the company			3,900,000		3,900,000
Liabilities, fair value							2,000,000
Scenario, Plan | Private Placement | RUSSIAN FEDERATION | Minimum
Commitments And Contingencies Disclosure [Line Items]
Revenue					26,800,000
Scenario, Plan | Santur Corporation
Commitments And Contingencies Disclosure [Line Items]
Amount received from escrow ,net					$ 1,900,000