Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Investments All Other Investments [Abstract]

Summary of Estimated Fair Values of Entity's Financial Instruments

The estimated fair values of the Company’s financial instruments are as follows:

			As at December 31, 2014						As at December 31, 2013
	Hierarchy Level		Carrying Amount			Fair Value			Carrying Amount			Fair Value
Cash and cash equivalents		1	$	126,311		$	126,311		$	130,394		$	130,394
Short-term investments		1		1,336			1,336			1,457			1,457
Loan receivable		2		1,268			1,268			1,075			1,075
Patent finance obligations		2		44,883			44,883			52,032			52,032
Foreign currency contracts		2		(732	)		(732	)		(668	)		(668	)

Information Regarding Aging and Collectability of Accounts Receivable

The following table provides information regarding the aging and collectability of the Company’s accounts receivable balances as at December 31, 2014:

Current	$	1,798
Past due 1 - 30 days		171
Past due 31 - 60 days		32
Past due 61 - 90 days		124
Over 91 days past due		211
Less allowance for doubtful accounts		(138	)
	$	2,198