Organization and Summary of Significant Accounting Policies (Other) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Test country	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Revenue Recognition
Minimum number of Oncotype tests by exclusive distribution agreements | Test			1
Minimum number of countries covered for distribution agreements establishment | country			90
Accrued refunds	$ 201,000		$ 201,000		$ 487,000
Allowance for Doubtful Accounts
Allowance for doubtful accounts	3,599,000		3,599,000		$ 4,508,000
Write-offs for doubtful accounts recorded against allowance	1,500,000	$ 1,500,000	4,500,000	$ 5,700,000
Bad debt expense	$ 1,500,000	$ 1,600,000	$ 3,100,000	$ 6,100,000