Stockholders Equity and Equity Incentive Programs - Additional Information (Detail) (USD $)	9 Months Ended		1 Months Ended	9 Months Ended					9 Months Ended	3 Months Ended		9 Months Ended								1 Months Ended		3 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended		1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Apr. 27, 2012 Private Placement	Sep. 30, 2013 Private Placement	Apr. 27, 2012 Private Placement Performance Guarantee	Apr. 27, 2012 Private Placement Capital Addition Purchase Commitments	Apr. 27, 2012 Private Placement Research and Development Arrangement	Dec. 31, 2012 Private Placement Embedded Derivative Financial Instruments	Sep. 30, 2013 Minimum Private Placement July 31, 2014 to March 31, 2015	Sep. 30, 2013 Employee Stock Option	Sep. 30, 2012 Employee Stock Option	Sep. 30, 2013 Employee Stock Option	Sep. 30, 2012 Employee Stock Option	Sep. 30, 2013 Employee Stock Purchase Plan	Sep. 30, 2012 Employee Stock Purchase Plan	Sep. 30, 2013 Employee Stock Purchase Plan Discounted Employee Stock Purchase Plan	Sep. 30, 2013 Employee Stock Purchase Plan Call Option	Sep. 30, 2013 Employee Stock Purchase Plan Put Option	Sep. 30, 2013 Common Stock Warrants	Aug. 06, 2013 Performance Vested Stock Options	Jul. 11, 2013 Performance Vested Stock Options	Sep. 30, 2013 Performance Vested Stock Options	Jun. 30, 2013 Performance Vested Stock Options	Sep. 30, 2013 Performance Vested Stock Options	Sep. 30, 2013 Restricted Stock Units	Sep. 30, 2012 Restricted Stock Units	Sep. 30, 2013 Restricted Stock Units	Sep. 30, 2012 Restricted Stock Units	Aug. 06, 2013 Stock Appreciation Rights (SARs)	Jul. 11, 2013 Stock Appreciation Rights (SARs)	Sep. 30, 2013 Stock Appreciation Rights (SARs)	Jun. 30, 2013 Stock Appreciation Rights (SARs)	Sep. 30, 2013 Stock Appreciation Rights (SARs)
Class Of Stock [Line Items]
Common stock										6,132,549		6,132,549		594,874					4,482
Shares granted										369,900	107,770	1,534,030	251,475							110,000	1,060,000
Weighted average exercise price										$ 7.78	$ 5.00	$ 5.82	$ 4.90
Number of days for stock price to be traded above mentioned price																					20 days									20 days
Minimum closing stock price																					$ 15.00									$ 15.00
Fair Value of options granted																							$ 5.68
Stock options vesting period																							7 years									7 years
Allocated share based compensation expense																						$ 200,000		$ 200,000							$ 49,000		$ 62,000
Unexercised stock options outstanding	3,979,813
Shares granted																									606,300	428,000	637,340	615,609	25,000	250,000	25,000		275,000
Weighted average exercise price																									$ 6.98	$ 4.96	$ 6.98	$ 5.27	$ 4.81		$ 8.33	$ 5.41	$ 5.40
Shares outstanding																									1,135,929		1,135,929				433,708		433,708
Shares purchased under the ESPP														262,860	257,335
Value of shares purchased under the ESPP														1,200,000	900,000
Percentage on the stock purchase right																15.00%	85.00%	15.00%
Common Stock Transfer Restriction Period			2 years
Targeted expansion completion date				Jul. 31, 2014
Extended date for achievement of Investment Obligation				Mar. 31, 2015
Expected aggregate revenue from sales of its products in the Russian Federation									26,800,000
Penalty payment derivative	238,000	138,000
Other non-current liability					30,000,000	15,000,000	15,000,000	5,000,000
Additional paid-in capital	444,552,000	438,858,000						4,900,000
Accumulated deficit subject to restriction	6,300,000
Accumulated profits	10.00%
Common Stock Issued			4,970,000
Common Stock Issue Price			$ 8.00
Proceeds from issuance of common stock, net of issuance costs			$ 39,800,000
Percentage of investment obligation that must be spent inside Russia			80.00%