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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities that are measured at fair value on a recurring basis
The following table presents, for each of the fair value hierarchy levels required under ASC 820, the Company's assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2018:
 
Fair Value Measurement Using
 
Quoted prices in
active markets for
identical assets
(Level 1)
 
Significant other
observable inputs
(Level 2)
 
Significant
unobservable
inputs
(Level 3)
Assets
 

 
 

 
 

Investments in money market funds*
$
111,489

 
$
—

 
$
—

Investments in investment-grade corporate debt securities*
$
—

 
$
24,004

 
$
—

The following table presents, for each of the fair value hierarchy levels required under ASC 820, the Company's assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2017:
 
Fair Value Measurement Using
 
Quoted prices in
active markets for
identical assets
(Level 1)
 
Significant other
observable inputs
(Level 2)
 
Significant
unobservable
inputs
(Level 3)
Assets
 

 
 

 
 

Investments in money market funds*
$
162,457

 
$
—

 
$
—


 
*
Investments in money market funds and investment-grade corporate debt securities with maturities less than 90 days are reflected in cash and cash equivalents in the accompanying Balance Sheets.
Schedule of changes in accumulated other comprehensive income (loss) associated with the unrealized loss on available for sale securities
The changes in accumulated other comprehensive loss associated with the unrealized loss on available for sale securities for the three and six months ended June 30, 2018 and June 30, 2017 were as follows:
 
Three months ended June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Beginning balance
$
—

 
$
(222
)
 
$
—

 
$
(212
)
Current period changes in fair value before reclassifications, net of tax
—

 
36

 
—

 
26

Amounts reclassified from accumulated other comprehensive income (loss), net of tax
—

 
—

 
—

 
—

Total other comprehensive income (loss)
—

 
36

 
—

 
26

Ending balance
$
—

 
$
(186
)
 
$
—

 
$
(186
)