Accrued Expenses and Other Current Liabilities (Tables)

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Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Accrued Expenses and Other Current Liabilities
Summary of accrued expenses and other current liabilities	December 31,       2013   2012   Payroll and related costs   $ 2,857   $ 1,429   Employee benefits     4,522     2,731   Accrued warranty     3,808     3,628   Other     3,231     2,541               ​ ​ ​ ​ ​ ​ ​ ​     $ 14,418   $ 10,329               ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​