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Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Institution	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Concentration of Credit Risk and Others Risks and Uncertainties [Abstract]
Number of financial institutions holding company's cash | Institution		2
Prepaid Expenses [Abstract]
Prepayment of facility lease for corporate promotional and marketing purposes		$ 4,000
Lease term		10 years
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost	$ 2,212	$ 3,968	$ 2,212	$ 3,135	$ 6,627
Adjusted Cost		2,635		2,617
Unrealized Gains		1		0
Unrealized Losses		0		(1)
Fair Value		2,636		2,616
Adjusted Cost		4,691		4,589
Fair Value		4,692		4,588
Investments Available for Sale		2,636		2,616
Cash [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost		2,056		1,972
Fair Value		2,056		1,972
Cash and Cash Equivalents		2,056		1,972
Mutual Funds [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost		1,087		616
Unrealized Gains		0		0
Unrealized Losses		0		0
Fair Value		1,087		616
Investments Available for Sale		1,087		616
U.S. Government Securities [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost		80
Unrealized Gains		0
Unrealized Losses		0
Fair Value		80
Investments Available for Sale		80
U.S. Agency Securities [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost		1,468		2,001
Unrealized Gains		1		0
Unrealized Losses		0		(1)
Fair Value		1,469		2,000
Investments Available for Sale		1,469		2,000
Recurring [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value		3,968		3,135
Fair Value		724		1,453
Cash and Cash Equivalents		3,968		3,135
Investments Available for Sale		724		1,453
Recurring [Member] | Cash [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value		2,056		1,972
Cash and Cash Equivalents		2,056		1,972
Recurring [Member] | Level 1 [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value		1,912		1,163
Fair Value		724		1,453
Cash and Cash Equivalents		1,912		1,163
Investments Available for Sale		724		1,453
Recurring [Member] | Level 1 [Member] | Mutual Funds [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value		1,087		616
Fair Value		0
Cash and Cash Equivalents		1,087		616
Investments Available for Sale		0
Recurring [Member] | Level 1 [Member] | U.S. Government Securities [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value		0
Fair Value		80
Cash and Cash Equivalents		0
Investments Available for Sale		80
Recurring [Member] | Level 1 [Member] | U.S. Agency Securities [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value		825		547
Fair Value		644		1,453
Cash and Cash Equivalents		825		547
Investments Available for Sale		644		1,453
2013 to 2016 Contract [Member]
Deferred Revenue [Abstract]
Total contractual payments received		$ 10,000
Revenue recognized	$ 375		$ 750
ASU 2014-09 [Member]
Deferred Revenue [Abstract]
Revenue recognized				2,500
ASU 2014-09 [Member] | Retained Earnings [Member]
New Accounting Pronouncements [Abstract]
Cumulative effect adjustments				(2,500)
ASU 2014-09 [Member] | Deferred Revenue [Member]
New Accounting Pronouncements [Abstract]
Cumulative effect adjustments				$ (2,500)

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