Stockholders' Equity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended						3 Months Ended			3 Months Ended				3 Months Ended	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012		Mar. 31, 2013 Embedded Derivative Financial Instruments	Mar. 31, 2013 Private Placement	Mar. 31, 2013 Private Placement Embedded Derivative Financial Instruments	Apr. 27, 2012 Private Placement Embedded Derivative Financial Instruments	Mar. 31, 2013 Private Placement Scenario One	Mar. 31, 2013 Private Placement Performance Guarantee	Mar. 31, 2013 Private Placement Performance Guarantee Capital Addition Purchase Commitments	Mar. 31, 2013 Private Placement Performance Guarantee General Working Capital And Research And Development Expenditures	Mar. 31, 2013 Private Placement Minimum July 31, 2014 to March 31, 2015	Dec. 31, 2012 Accumulated Translation Adjustment	Mar. 31, 2013 Restricted Stock Units (RSUs)	Mar. 31, 2012 Restricted Stock Units (RSUs)	Mar. 31, 2013 Stock Appreciation Rights (SARs)	Mar. 31, 2012 Stock Appreciation Rights (SARs)	Mar. 31, 2013 RUSSIAN FEDERATION Private Placement Minimum
Class Of Stock [Line Items]
Intrinsic value of options exercised	$ 16,000		$ 14,000
Intrinsic value of units exercised																$ 301,000	$ 0	$ 0	$ 6,000
Equity Restrictions															6,300,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate															10.00%
Common Stock Issued							4.97
Common Stock Issue Price							$ 8.00
Proceeds from issuance of common stock, net of issuance costs							39,800,000
Common Stock Transfer Restriction Period							2 years
Contractual Obligation								5,000,000	5,000,000		30,000,000	15,000,000	15,000,000
Percentage of investment obligation that can be satisfied by research and development																				80.00%
Targeted expansion completion date										Jul. 31, 2014
Expected aggregate revenue from sales of its products in the Russian Federation for period July 1, 2012 to March 31, 2015														26,800,000
Additional paid-in capital	440,144,000	[1]		438,858,000	[2]	4,862,000
Penalty payment derivative	$ 138,000			$ 138,000

[1] Restated and Revised, see Notes 2 and 7

[2] Revised, see Note 2