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401(k) plan	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
401(k) plan	401(k) plan The Company maintains a 401(k) plan for its employees. Employee contributions are voluntary. The Company may match employee contributions in amounts to be determined at the Company’s sole discretion. The Company provides an 92% matching contribution for up to the first 6% of each contributing employee’s base salary contributions. The Company made matching contributions to the 401(k) plan and recorded expense of approximately $2.2 million, $1.6 million and $1.1 million for the years ended December 31, 2018, 2017 and 2016, respectively.

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- Definition

The entire disclosure of an entity's employee compensation and benefit plans, excluding share-based compensation and including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, life insurance, severance, health care, unemployment and other benefit plans.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 712
-URI http://asc.fasb.org/topic&trid=2197446

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-URI http://asc.fasb.org/topic&trid=2127225

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- References

No definition available.

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