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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Summary of Fair Values of Assets and Liabilities Measured on a Recurring Basis

The following tables summarize the Company’s assets and liabilities that require fair value measurements on a recurring basis and their respective input levels based on the fair value hierarchy (in thousands):

 

 

 

 

 

 

 

Fair Value Measurements at End of Period Using:

 

 

 

Total

 

 

Quoted Market

Prices for

Identical Assets

(Level 1)

 

 

Significant

Other

Observable

Inputs

(Level 2)

 

 

Significant

Unobservable

Inputs

(Level 3)

 

March 31, 2018

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash equivalents:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Commercial paper

 

$

2,197

 

 

$

 

 

$

2,197

 

 

$

 

Asset-backed securities

 

 

1,099

 

 

 

 

 

 

1,099

 

 

 

 

 

 

$

3,296

 

 

$

 

 

$

3,296

 

 

$

 

Marketable securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate debt securities

 

$

28,482

 

 

$

 

 

$

28,482

 

 

$

 

Commercial paper

 

 

13,801

 

 

 

 

 

 

13,801

 

 

 

 

Certificates of deposit

 

 

9,134

 

 

 

 

 

 

9,134

 

 

 

 

Asset-backed securities

 

 

4,788

 

 

 

 

 

 

4,788

 

 

 

 

 

 

$

56,205

 

 

$

 

 

$

56,205

 

 

$

 

 

 

 

 

 

 

 

Fair Value Measurements at End of Period Using:

 

 

 

Total

 

 

Quoted Market

Prices for

Identical Assets

(Level 1)

 

 

Significant

Other

Observable

Inputs

(Level 2)

 

 

Significant

Unobservable

Inputs

(Level 3)

 

December 31, 2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash equivalents:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate debt securities

 

$

8,274

 

 

$

 

 

$

8,274

 

 

$

 

Repurchase agreements

 

 

5,000

 

 

 

 

 

 

5,000

 

 

 

 

 

 

$

13,274

 

 

$

 

 

$

13,274

 

 

$

 

Marketable securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate debt securities

 

$

24,713

 

 

$

 

 

$

24,713

 

 

$

 

Certificates of deposit

 

 

13,651

 

 

 

 

 

 

13,651

 

 

 

 

Commercial paper

 

 

12,329

 

 

 

 

 

 

12,329

 

 

 

 

Asset-backed securities

 

 

2,099

 

 

 

 

 

 

2,099

 

 

 

 

 

 

$

52,792

 

 

$

 

 

$

52,792

 

 

$