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Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 37,875 $ 37,875
Accumulated Amortization (4,930) (4,166)
Foreign Currency Translation (956) (570)
Net Carrying Amount 31,989 33,139
Customer Relationships [Member] | Allenex [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 12,650 12,650
Accumulated Amortization (1,609) (1,394)
Foreign Currency Translation (411) (250)
Net Carrying Amount $ 10,630 $ 11,006
Estimated useful life of identified intangible asset 12 years 9 months 18 days 13 years
Customer Relationships [Member] | Conexio [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 28 $ 28
Accumulated Amortization (4) (3)
Foreign Currency Translation 0 1
Net Carrying Amount $ 24 $ 26
Estimated useful life of identified intangible asset 7 years 9 months 18 days 8 years 1 month 6 days
Developed Technology [Member] | Olerup [Member] | SSP [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 11,650 $ 11,650
Accumulated Amortization (2,244) (1,942)
Foreign Currency Translation (392) (258)
Net Carrying Amount $ 9,014 $ 9,450
Estimated useful life of identified intangible asset 7 years 9 months 18 days 8 years
Trademarks [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 2,260 $ 2,260
Accumulated Amortization (348) (310)
Foreign Currency Translation (13) 16
Net Carrying Amount $ 1,899 $ 1,966
Estimated useful life of identified intangible asset 12 years 9 months 18 days 13 years
Acquired Technology - QTYPE | Olerup [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 4,510 $ 4,510
Accumulated Amortization (454) (376)
Foreign Currency Translation (143) (84)
Net Carrying Amount $ 3,913 $ 4,050
Estimated useful life of identified intangible asset 12 years 9 months 18 days 13 years
Acquired Technology SBT [Member] | Olerup [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 127 $ 127
Accumulated Amortization (18) (14)
Foreign Currency Translation 3 5
Net Carrying Amount $ 112 $ 118
Estimated useful life of identified intangible asset 7 years 9 months 18 days 8 years 1 month 6 days
Acquired Technology dd-cfDNA [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 6,650 $ 6,650
Accumulated Amortization (253) (127)
Foreign Currency Translation 0 0
Net Carrying Amount $ 6,397 $ 6,523
Estimated useful life of identified intangible asset 12 years 7 months 6 days 12 years 10 months 24 days