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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Goodwill And Intangible Assets [Line Items]      
Goodwill $ 12,005,000   $ 12,005,000
Description of annual goodwill impairment test On January 1, 2017, the Company adopted ASU 2017-04, which eliminated the Step 2 requirement of the goodwill impairment test. Instead, the goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount. The Company determined that the decrease in its market capitalization in the first quarter of 2017 constituted an indicator of impairment and therefore a goodwill impairment test was completed as of March 31, 2017.    
Goodwill impairment $ 0 $ 1,958,000  
Amortization expense of intangible assets 600,000 600,000  
Cost of Product [Member]      
Goodwill And Intangible Assets [Line Items]      
Amortization expense of intangible assets 400,000 400,000  
Sales and marketing expense [Member]      
Goodwill And Intangible Assets [Line Items]      
Amortization expense of intangible assets 200,000 200,000  
Post-Transplant [Member]      
Goodwill And Intangible Assets [Line Items]      
Goodwill $ 12,000,000   $ 12,000,000
Pre-Transplant [Member]      
Goodwill And Intangible Assets [Line Items]      
Description of goodwill impairment method for fair value determination determined that the fair value of the Pre-Transplant reporting unit was $3.5 million, which was lower than its carrying value.    
Fair value of reporting unit   $ 3,500,000  
Reporting unit, discount rate   16.60%  
Reporting unit, terminal growth rate   3.20%  
Reporting unit, capitalization multiple   $ 7.48  
Pre-Transplant [Member] | Maximum [Member]      
Goodwill And Intangible Assets [Line Items]      
Goodwill impairment   $ 2,000,000