Collaboration and Licensing Agreements - Additional Information (Detail)	1 Months Ended			3 Months Ended		6 Months Ended
	Jul. 31, 2013 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2013 EUR (€)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2013 EUR (€)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Description of agreement expire term						The agreement will expire at the later of the last-to-expire patent in the EEA or ten years from the first commercial sale of the test in the EEA, which occurred in 2014.
Common stock value				$ 19,000		$ 19,000		$ 12,000
Refundable upfront payments		$ 344,000	€ 250,000
Upfront cash payment		503,000	€ 387,500
Revenues recognized from the arrangement				16,000	$ 16,000	31,000	$ 33,000
Royalty revenues				0	$ 89,000	100,000	$ 200,000
Royalty revenues receivable balance				$ 0		$ 0		$ 0
Diaxonhit (DHT) [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Common stock value		$ 503,000							€ 387,500
Shares sold for consideration	$ 467,000