Organization and Summary of Significant Accounting Policies (Other) (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) Test country	Mar. 31, 2016 USD ($)	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	$ 390,000		$ 487,000
Allowance for Doubtful Accounts
Allowance for doubtful accounts	3,724,000		$ 4,508,000
Write-offs for doubtful accounts recorded against allowance	1,300,000	$ 2,400,000
Bad debt expense	$ 412,000	$ 2,300,000