| Cash and Cash Equivalents | 9 Months Ended | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sep. 30, 2018 | |||||||||||||||||||||||||||||||||
| Cash and Cash Equivalents [Abstract] | |||||||||||||||||||||||||||||||||
| Cash and Cash Equivalents | 3.Cash and Cash Equivalents 
 The Company’s cash and cash equivalents consist of the following: 
 
 
 
 | ||||||||||||||||||||||||||||||||
| X | ||||||||||
| 
- References No definition available. 
 | 
| X | ||||||||||
| 
- Definition The entire disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 |