Revenue (Policies)	12 Months Ended
Dec. 31, 2018
Revenue [Abstract]
Revenue recognition	Revenue recognition Effective January 1, 2018, we adopted a comprehensive new revenue recognition standard using a modified retrospective basis. The comparative information for the years ended December 31, 2017 and December 31, 2016 has not been adjusted and continues to be reported under the previous revenue standard, the accounting policies for which are discussed below. Our services and products are generally sold based upon purchase orders or contracts with our customers that include fixed or determinable prices but do not include right of return provisions or other significant post-delivery obligations. We recognize revenue from product sales when title passes to the customer, the customer assumes risks and rewards of ownership, collectability is reasonably assured and delivery occurs as directed by our customer. Service revenue, including training and consulting services, is recognized when the services are rendered and collectability is reasonably assured. Rates for services are typically priced on a per day, per meter, per man-hour or similar basis. revenue recognition is based on the transfer of control, or our customer’s ability to benefit from our services and products in an amount that reflects the consideration we expect to receive in exchange for those services and products. The vast majority of our service and product contracts are short-term in nature. In recognizing revenue for our services and products, we determine the transaction price of purchase orders or contracts with our customers, which may consist of fixed and variable consideration. Determining the transaction price may require significant judgment, which includes identifying performance obligations in the contract, determining whether promised services can be distinguished in the context of the contract, and estimating the amount of variable consideration to include in the transaction price. We also assess our customer’s ability and intention to pay, which is based on a variety of factors including our customer’s historical payment experience and financial condition. Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 20 days to 60 days. Other judgments involved in recognizing revenue include an assessment of progress towards completion of performance obligations for certain long-term contracts, which involve estimating total costs to determine our progress towards contract completion and calculating the corresponding amount of revenue to recognize.

Revenue (Policies)

12 Months Ended

Dec. 31, 2018

Effective January 1, 2018, we adopted a comprehensive new revenue recognition standard using a modified retrospective basis. The comparative information for the years ended December 31, 2017 and December 31, 2016 has not been adjusted and continues to be reported under the previous revenue standard, the accounting policies for which are discussed below.

Our services and products are generally sold based upon purchase orders or contracts with our customers that include fixed or determinable prices but do not include right of return provisions or other significant post-delivery obligations. We recognize revenue from product sales when title passes to the customer, the customer assumes risks and rewards of ownership, collectability is reasonably assured and delivery occurs as directed by our customer. Service revenue, including training and consulting services, is recognized when the services are rendered and collectability is reasonably assured. Rates for services are typically priced on a per day, per meter, per man-hour or similar basis. revenue recognition is based on the transfer of control, or our customer’s ability to benefit from our services and products in an amount that reflects the consideration we expect to receive in exchange for those services and products. The vast majority of our service and product contracts are short-term in nature. In recognizing revenue for our services and products, we determine the transaction price of purchase orders or contracts with our customers, which may consist of fixed and variable consideration. Determining the transaction price may require significant judgment, which includes identifying performance obligations in the contract, determining whether promised services can be distinguished in the context of the contract, and estimating the amount of variable consideration to include in the transaction price.

We also assess our customer’s ability and intention to pay, which is based on a variety of factors including our customer’s historical payment experience and financial condition. Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 20 days to 60 days. Other judgments involved in recognizing revenue include an assessment of progress towards completion of performance obligations for certain long-term contracts, which involve estimating total costs to determine our progress towards contract completion and calculating the corresponding amount of revenue to recognize.