Company Operations and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	0 Months Ended		12 Months Ended			1 Months Ended
	Sep. 10, 2014	Nov. 06, 2012	Dec. 31, 2014 Segment	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Number of business segment			1
Cash and cash equivalents maximum maturity period			3 months
Account receivable, reserves			$ 8,200,000	$ 5,800,000
Net of reserves, inventories			2,200,000	600,000
Depreciation and Amortization			10,300,000	7,900,000	7,300,000
Amortization expense			17,400,000	16,600,000	15,400,000
Impairment loss			3,558,000	0	0
Maximum Amount Of Milestone Based Grant Related To Research And Commercialization Activities	12,600,000	8,300,000
Fund received for research and development activities		2,600,000
Revenue Recognition Milestone Method Payment Received	10,600,000			2,500,000
Unbilled Change Orders, Amount Expected to be Collected within One Year			2,400,000
Unbilled Change Orders, Amount Expected to be Collected after One Year			2,800,000
Company's grant revenue			6,300,000	2,600,000	500,000
Restricted cash			3,127,000	969,000
Deferred grant revenue			6,330,000	2,029,000
Reimbursement related to research and development expense			400,000	1,400,000	3,000,000
Reimbursement percentage upon project development cost			50.00%
Percentage cost plus sale assays to third party			20.00%
Interest in gross margin for sales from third party to end customer			40.00%
Finite-Lived Intangible Asset, Useful Life			3 years 6 months
Product shipment costs			2,300,000	2,200,000	1,600,000
Advertising cost expensed			400,000	700,000	200,000
Excluded from Computation of Earnings Per Share, Amount			1.1
Stock Options excluded from calculation of diluted (loss) earnings per share ("EPS")			1.0	0.5	1.1
Restructuring costs and asset impairment charges			0	1,800,000
2015			10,044,000
Other Current Liabilities [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Prior period reclassification adjustment				700,000	800,000
Other Noncurrent Liabilities [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Prior period reclassification adjustment				700,000
Software development costs [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			5 years
Capitalized Software Costs [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense			600,000	300,000	400,000
Distribution rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Period of instrument supply agreement with Life Technologies Corporation						6 years
Acquisition of distribution rights						800,000
Finite-Lived Intangible Asset, Useful Life						6 years
License agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense			8,000,000	8,000,000	8,000,000
Finite-Lived Intangible Asset, Useful Life			5 years 10 months 24 days
License agreements [Member] | Cost of sales [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense			8,000,000	0	0
2015			700,000
Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of the assets			3 years
Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of the assets			15 years
Software and Software Development Costs [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Impairment loss			$ 1,500,000